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Όρος
Ορισμός
radical (noun) expressing the belief that there should be great or extreme social or political change, δραστικός
Example
Radicals protested against the new measures.
Antonym
conservative
Word Family
radically 
radioactivity (noun) the quality that some atoms have of producing energy, which can be very harmful to health, ραδιενέργεια
Example
Uranium has a high level of radioactivity.
Word Family
radioactive
radium (noun) a radioactive element which is used in the treatment of some diseases, especially cancer, ράδιο
Example
Radium occurs naturally in very small amounts in minerals containing uranium.
rain forest (noun) a tropical forest with tall trees that are very close together, growing in an area where it rains a lot, δάσος της βροχής
Example
Rain forests have a great variety of plants and animals.
raise (verb) to increase an amount, number, or level, ανεβάζω
Example
Many shops have raised their prices.
Synonym
increase
Antonym
lower, sink
range (noun) a group of different things of the same general type, ποικιλία, γκάμα
Example
You can choose from a wide range of subjects.
rank (noun) a position in an organization showing the importance of the person having it, θέση
Example
He has just been promoted to the rank of captain.
Synonym
position
rarely (adverb) not often, σπάνια
Example
She rarely goes shopping for new clothes.
Synonym
seldom
rate (verb) to think that someone or something has a particular quality, value, or standard, κατατάσσω
Example
The company seems to rate him very highly.
raw (adjective) not cooked or changed by any process, ωμός
Example
Raw carrots are one of my favourite snacks.
reach (verb) to extend or stretch as far as, φτάνω
Example
She's too small to reach the table.
react (verb) to act, or feel a certain way, in response to something, αντιδρώ
Example
I thought he might be angry when I said that, but he didn't react at all.
Word Family
reaction
real (adjective) not imagined; actually existing; true, πραγματικός
Example
It's hard to believe that real dinosaurs once walked the earth.
Synonym
actual, authentic,
Antonym
imaginary, unreal
Word Family
reality
reason (noun) a cause or explanation for an action, opinion, or event, αιτία
Example
He had a good reason for being late.
Synonym
argument, cause, ground
reasonable (adjective) using good sense and clear thinking, λογικός
Example
It's a reasonable price for such a good dress.
Synonym
logical, rational
Antonym
absurd, irrational, unreasonable
Word Family
reasonably 
rebel (noun) one who fights against or does not obey authority, επαναστάτης
Example
He was a rebel as a teenager, and he was often in trouble for breaking the rules.
Word Family
rebellious
recent (adjective) having to do with or happening in the very near past, πρόσφατος
Example
After the recent storm, many people are still without electricity.
Synonym
late
Antonym
distant
Word Family
recently
recently (adverb) not long ago, πρόσφατα
Example
Have you seen any good films recently?
Synonym
lately
receptionist (noun) an office worker employed primarily to greet visitors, and answer routine questions, ρεσεψιονίστ
Example
A receptionist is often the first business contact a person will meet at any organization.
Word Family
reception
recognise (verb) to know someone or something because you have seen them before, αναγνωρίζω
Example
I recognized her from her picture.
Synonym
place, spot, remember
Word Family
recognition, recognizable, recognizably 
recommend (verb) to say that someone or something is good or suitable for a particular purpose, συστήνω
Example
I would recommend this book for teenagers.
Word Family
recommendation 
record (noun) a flat, round, plastic disc that music is stored on, used especially in the past, δίσκος βινυλίου
Example
My dad's got a big record collection.
Synonym
album
Word Family
recording
record (verb) to put in writing, καταγράφω
Example
The nurse recorded my height and weight in my health chart.
Synonym
note, put down
Word Family
recorded 
recreate (verb) to make something exist or happen again, αναπαράγω
Example
The group recreated several Greek plays.
Synonym
regenerate
Word Family
recreation
recycle (verb) to collect and treat rubbish in order to produce useful materials which can be used again, ανακυκλώνω
Example
The Japanese recycle more than half their waste paper.
Word Family
recycling, recycled
redesign (verb) to make again a drawing or plan of something that will be made or built, επανασχεδιάζω
Example
He had his house redesigned as the first design wasn't successful.
refer (verb) to speak of; mention, αναφέρομαι
Example
She referred to his work in her speech.
Synonym
mention
Word Family
reference
reflect (verb) send light back and not absorb it, αντανακλώ
Example
The ocean reflected the setting sun.
Synonym
mirror
Word Family
reflection, reflecting
refund (noun) an amount of money that is given back to you, especially because you are not happy with a product that you have bought, επιστροφή χρημάτων
Example
I was given a refund of fifty euros.
Word Family
refundable
refuse (verb) to say that you will not do or accept something, αρνούμαι
Example
Marios refused to go on holiday with his parents because he wanted to be with his friends.
Synonym
decline, turn down
Antonym
accept
Word Family
refusal
regard (verb) to consider or have an opinion about something or someone, θεωρώ
Example
I regard her as one of my best friends.
Synonym
consider
region (noun) a large space or area, περιοχή
Example
This region is famous for its apples.
Synonym
area
Word Family
regional
regularly (adverb) often, συχνά
Example
Accidents occur regularly on this road.
Synonym
frequently
Word Family
regular
relate (verb) to have a connection, σχετίζομαι
Example
Her question did not relate to the topic we were discussing.
Synonym
apply, connect, link
Word Family
related, relation
relationship (noun) a connection between two or more things, σχέση
Example
There is a relationship between exercise and good health.
Synonym
connection
relaxed (adjective) feeling calm, comfortable, and not worried or annoyed, ήρεμος
Example
George was lying in the sun looking very relaxed and happy.
Word Family
relax, relaxation
release (verb) to allow to be shown, sold, or published, θέτω σε κυκλοφορία
Example
When was the "Titanic" released?
Word Family
release (n)
relevant (adjective) connected with what is happening or being discussed, σχετικός
Example
We can find relevant information on the internet.
Synonym
pertinent
Antonym
irrelevant
Word Family
relevance
remote control (noun) a device held in the hand that is used to control a television set, or some other mechanical object from a distance, τηλεκοντρόλ
Example
Have you seen the remote control for the TV anywhere?
repair (verb) to fix something that is broken or damaged, επιδιορθώνω
Example
I must repair my bike.
Synonym
fix, mend, service
Antonym
damage, ruin
repel (verb) to force back, απωθώ
Example
These magnets are repelling each other.
Antonym
attract
Word Family
repellent
replace (verb) to put in place of, αντικαθιστώ
Example
She wants to replace her old camera with a digital one.
Word Family
replaceable
reply (noun) an answer in words or writing, απάντηση
Example
I asked her a question, but she made no reply.
Synonym
acknowledgment, answer, response
reply (verb) to give an answer in words or writing, απαντώ
Example
Did you reply to your cousin's letter?
Synonym
answer, respond
report (noun) a description of an event or situation, αναφορά
Example
I enjoyed writing the book report.
Synonym
account
Word Family
reporter
report (verb) to tell; state, αναφέρω
Example
I reported the good news to my friends.
Synonym
narrate, relate, say, state, tell
Word Family
reporter
require (verb) to need, απαιτώ
Example
Babies require a lot of attention.
Synonym
call for, demand
Word Family
requirement
rescue (verb) to help someone or something out of a dangerous, harmful or unpleasant situation, διασώζω
Example
The firefighters rescued three people from the burning building.
Synonym
free, save
Word Family
rescuer
research (noun) the serious study and collecting of information about something, έρευνα
Example
Research has shown that there is a connection between genes and behaviour.
Word Family
researcher 
research (verb) to study a subject in order to discover new information about it, ερευνώ
Example
I researched the Greek Civil War for my history class.
Synonym
investigate
Word Family
researcher 
resort (noun) a place where people go to relax and have fun while on vacation, θέρετρο
Example
My family went to a tropical resort this winter.
respect (noun) politeness, honour and care shown towards someone or something that is considered important, σεβασμός
Example
She has no respect for other people's property.
Synonym
regard
Antonym
contempt, disrespect, scorn
Word Family
respectful, respectable
respond (verb) to give a reply, in words or otherwise, ανταποκρίνομαι
Example
I asked her a question, but she did not respond.
Synonym
answer, reply, return
Word Family
response
response (noun) a written or spoken answer; reply, απόκριση
Example
I'm writing in response to your letter of 17 June.
Synonym
answer, reply
Word Family
response less 
responsible (adjective) showing good judgement and able to be trusted, υπέυθυνος
Example
She is very responsible and can be trusted.
Synonym
rational, sensible
Antonym
irresponsible
Word Family
responsibly, responsibility
rest (noun) a piece or part that is left, υπόλοιπος
Example
Will you eat the rest of the cake?
Synonym
remainder
restore (verb) to return to an earlier or original condition, αναπαλαιώνω
Example
It took many months to restore the old house.
Synonym
fix, repair
Antonym
deteriorate, ruin
Word Family
restoration 
result (noun) something that happens because of something else, αποτέλεσμα
Example
We were surprised by the result of the experiment.
Synonym
outcome
return (verb) to go back or come back, επιστρέφω
Example
We returned home tired after our tennis game.
Synonym
go back
Antonym
depart
reuse (verb) to use again or use more than once, επαναχρησιμοποιώ
Example
She will not reuse her glass until it has been washed.
Word Family
reusable
review (noun) a report in a newspaper, magazine, or programme that gives an opinion about a new book, film, etc, κριτική
Example
She bought this book because she read an excellent review of it in the newspaper.
Synonym
critique
revolt (noun) an act of trying to change a government or other authority, often using violence, εξέγερση
Example
The king tried to stop the revolt against him.
Synonym
rebellion, revolution
revolve (verb) to move in a circle around a fixed point, περιστρέφομαι
Example
The Earth revolves around the Sun.
Synonym
rotate, spin
Word Family
revolving
ringlet (noun) a long curl of hair that hangs down, μπούκλα
Example
You could use a curling iron and give your hair nice ringlet curls.
rock the boat (phrase) to disrupt a balance or routine, αναστατώνω
Example
I tried to suggest a few ways in which we might improve our image and was told very firmly not to rock the boat.
role (noun) the character played by an actor, ρόλος
Example
The role of Hamlet is a challenge for any actor.
Synonym
part
rope (noun) very thick, strong string, σκοινί
Example
They used ropes to tie and lift the boxes.
Synonym
band, cable
route (noun) a road or course of travel from one place to another, διαδρομή
Example
The bus uses a different route than it used to.
Synonym
path, road, way
rub (verb) to use pressure on with a back and forth motion, τρίβω
Example
He rubbed his sore arm.
rubber (noun) a strong material that bends easily and is used to make tyres, boots, etc, καουτσούκ
Example
For convenience and safety, guests are advised to wear rubber shoes, long trekking pants and to bring extra shirts and jackets in case of rain.
rubbish (noun) material that is thrown away or useless; garbage, σκουπίδια
Example
My husband takes out the rubbish every night.
Synonym
garbage, junk, litter, trash
ruins (noun) the broken parts that are left from an old building or town, ερείπια
Example
Many tourists visit the ruins of Pompeii every year.
Synonym
remains
rule (noun) a law or direction that tells you should or should not do, κανόνας
Example
The grammar rules are at the end of the book.
run out of (verb) to finish, use, or sell all of something so that there is none left, ξεμένω
Example
We have run out of milk and juice.
Synonym
consume, eat, finish