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Όρος
Ορισμός
obedient (adj) doing, or willing to do, what you have been told to do by someone in authority
Example
He isn't obedient when his father is away.
Synonym
docile, dutiful
Antonym
disobedient, unruly
Word Family
obedience, obediently
observation (n) the act or an instance of perceiving the environment through one of the senses
Example
A good artist must be skilled at close observation.
Synonym
notice, view, watch
Word Family
observational, observationally
observatory (n) a building that has equipment for studying the sun, moon, planets, and stars
Example
Most ground-based observatories are located far from major centers of population.
observe (v) to watch someone or something carefully
Example
The parents observed that their child enjoyed music.
Synonym
notice, perceive, remark
Antonym
miss
Word Family
observer, observation
obviously (adv) in a way that is easy to understand or see
Example
Obviously the school cannot function without teachers.
Synonym
clearly
occasion (n) an event or the time at which it happens
Example
It was a sad occasion when their dog died.
Synonym
event, happening, time
occur (v) to take place; happen
Example
Where were you when the crime occurred?
Synonym
happen, take place
Word Family
occurrence
odd (adj) different from what is expected or usual; strange
Example
Joe looked odd in his striped pants, green shoes, and flowered hat.
Synonym
curious, eccentric, peculiar
Antonym
normal, ordinary, regular, usual
Word Family
oddly 
odyssey (n) an extended, wandering journey of adventure or quest
Example
He was finally home after his long and perilous odyssey.
off-road cycling (n) cycling in rough country such as hills and deserts
Example
Off-road cycling is very demanding.
official (adj) approved by the government or someone in authority
Example
There will be an official investigation into the causes of the explosion.
Antonym
unofficial
Word Family
officially 
oil well (n) a well from which petroleum is drawn or pumped
Example
There are numerous oil wells in Saudi Arabia .
omit (v) to leave out; not include
Example
She omitted the second page from the speech.
Synonym
exclude
Antonym
include
Word Family
omission
once (adv) only one time
Example
Tim gets his hair cut once a month.
opponent (n) a person who fights, plays, or takes a position against another person
Example
He knocked out his opponent in the third round.
Synonym
adversary, antagonist, rival
Antonym
proponent
opportunity (n) a situation in which it is possible for you to do something
Example
Her trip to Asia was an opportunity to learn about different cultures.
Synonym
occasion
oppose (v) to think, act, or be against; resist
Example
The students oppose the idea of a longer school day.
Synonym
block, combat, cross, resist
Antonym
advocate, champion, uphold
Word Family
opposed, opposition, opposer
opposition (n) being against, or having someone against another
Example
I am in opposition to my parents' plans to move.
Synonym
resistance
order (n) the way in which things are arranged, in relation to one another or according to a particular characteristic
Example
Please write your spelling words in alphabetical order.
Synonym
position, shape
Antonym
disorder
Word Family
orderless, orderedness
orderly (adj) tidy or organized
Example
He needs to organize his ideas in a more orderly way.
Synonym
neat, tidy
Antonym
disorderly, messy, random
Word Family
orderliness 
ordinary (adj) usual or normal
Example
In their real life film stars are just ordinary people, like you and me.
Synonym
everyday, normal, regular, usual
Antonym
odd, special, strange
Word Family
ordinarily 
organ (n) a part of the body of an animal or plant which performs a special job
Example
The heart, stomach, and skin are examples of organs.
Word Family
organic
organic (adj) having to do with or coming from living things
Example
Protein is an organic substance.
Word Family
organically
original (adj) existing since the beginning, or being the earliest form of something
Example
Of all the Frankenstein movies, I like the original one best.
Synonym
earliest, first, initial
Antonym
final
Word Family
originally, originality
originally (adv) at first
Example
Originally it was a bedroom, but we turned it into a study.
Synonym
initially, primarily
Antonym
eventually
other (adj) different from the one or ones mentioned
Example
No, I want the other dress.
Synonym
same
Word Family
otherness
outdoor (adj) happening or used outside of any building.
Example
They are building an outdoor pool.
Antonym
indoor
outfit (n) a complete set of clothes
Example
I've got a cowboy outfit for the carnival party.
outgoing (adj) liking to talk to and interested in others
Example
Helen has an outgoing personality.
Synonym
extroverted, friendly, social
Antonym
aloof
outline (n) a short, written plan of the main ideas of a book, speech, or report
Example
In the outline we only write the most basic ideas.
oval (adj) having the general shape of an egg; ellipse
Example
She gave me an oval mirror.
overall (adj) including nearly all; general
Example
Their overall goal for the day was to enjoy themselves.
Synonym
altogether, main, general
overcharge (v) to charge someone too much money for something
Example
I will not go to that restaurant again because I was overcharged.
Synonym
soak
overcrowd (v) containing too many people or things
Example
Athens is an overcrowded city.
Synonym
pack
Word Family
overcrowded 
overdo (v) to do too much or go too far
Example
After a heart attack you have to be careful not to overdo it.
overestimate (v) To think something is better, more important etc than it really is
Example
He tends to overestimate his own abilities.
Word Family
overestimation 
overflow (v) to flow over the top edge of a container
Example
Water overflowed from the sink.
overhead locker (n) one of a row of small cupboards above the seats in a plane where passengers can store things during a flight
Example
Only small bags are allowed in overhead lockers.
overreact (v) to respond or react too strongly
Example
He overreacted to the news by screaming loudly.
Word Family
overreaction 
owe (v) to have to pay; be in debt to someone
Example
I owe 500 dollars to my landlord.
owner (n) a person or group to whom something belongs
Example
We need to find out who the owner of this notebook is and return it.
Word Family
ownership
ozone layer (n) an atmospheric layer between ten and twenty miles above the earth that contains a large amount of ozone, which absorbs certain types of harmful radiation from space
Example
The ozone layer prevents harmful ultraviolet light from the sun from reaching the Earth.