Υπενθυμίζουμε ότι η μηδενική χρέωση μέσω κινητής τηλεφωνίας ισχύει για τις ιστοσελίδες που αναφέρονται στο
 (δελτίο τύπου του ΥΠΑΙΘ), όπου περιλαμβάνονται τα Διαδραστικά Σχολικά Βιβλία  ( e-books.edu.gr ), η κεντρική πύλη αναζήτησης ΦΩΤΟΔΕΝΤΡΟ  ( photodentro.edu.gr ) και όλα τα Αποθετήρια Εκπαιδευτικών Πόρων Φωτόδεντρο ( photodentro.edu.gr/lor , photodentro.edu.gr/video ,  photodentro.edu.gr/edusoft ,  photodentro.edu.gr/ugc , photodentro.edu.gr/oep , photodentro.edu.gr/i-create ).
Η προβολή περιεχομένου που φιλοξενείται σε εξωτερικά αποθετήρια ή ιστοσελίδες εκτός των παραπάνω ή το άνοιγμα συνδέσμων που οδηγούν σε εξωτερικό περιεχόμενο δεν υπάγονται στη μηδενική χρέωση.
    Όρος  | 
		 Ορισμός  | 
	       
|---|---|
| obedient (adj) | doing, or willing to do, what you have been told to do by someone in authority
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| observation (n) | the act or an instance of perceiving the environment through one of the senses
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| observatory (n) | a building that has equipment for studying the sun, moon, planets, and stars
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| observe (v) | to watch someone or something carefully
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| obviously (adv) | in a way that is easy to understand or see
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| occasion (n) | an event or the time at which it happens
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| occur (v) | to take place; happen
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| odd (adj) | different from what is expected or usual; strange
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| odyssey (n) | an extended, wandering journey of adventure or quest
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| off-road cycling (n) | cycling in rough country such as hills and deserts
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| official (adj) | approved by the government or someone in authority
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| oil well (n) | a well from which petroleum is drawn or pumped
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| omit (v) | to leave out; not include
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| once (adv) | only one time
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| opponent (n) | a person who fights, plays, or takes a position against another person
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| opportunity (n) | a situation in which it is possible for you to do something
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| oppose (v) | to think, act, or be against; resist
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| opposition (n) | being against, or having someone against another
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| order (n) | the way in which things are arranged, in relation to one another or according to a particular characteristic
  | 
	       
| orderly (adj) | tidy or organized
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| ordinary (adj) | usual or normal
  | 
	       
| organ (n) | a part of the body of an animal or plant which performs a special job
  | 
	       
| organic (adj) | having to do with or coming from living things
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| original (adj) | existing since the beginning, or being the earliest form of something
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| originally (adv) | at first
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| other (adj) | different from the one or ones mentioned
  | 
	       
| outdoor (adj) | happening or used outside of any building.
  | 
	       
| outfit (n) | a complete set of clothes
  | 
	       
| outgoing (adj) | liking to talk to and interested in others
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| outline (n) | a short, written plan of the main ideas of a book, speech, or report
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| oval (adj) | having the general shape of an egg; ellipse
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| overall (adj) | including nearly all; general
  | 
	       
| overcharge (v) | to charge someone too much money for something
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| overcrowd (v) | containing too many people or things
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| overdo (v) | to do too much or go too far
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| overestimate (v) | To think something is better, more important etc than it really is
  | 
	       
| overflow (v) | to flow over the top edge of a container
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| overhead locker (n) | one of a row of small cupboards above the seats in a plane where passengers can store things during a flight
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| overreact (v) | to respond or react too strongly
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| owe (v) | to have to pay; be in debt to someone
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| owner (n) | a person or group to whom something belongs
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| 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
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