- The fifteenth letter of the Appendix:Roman script, English alphabet, preceded by N and followed by P.
- A blood type that has no antigens and may only receive type O blood and nothing else, but may donate to all.
- (cricket) The number of overs bowled.
<!-- Do these belong here, or at the latin progenitor, below?
- Any smell, whether fragrant or offensive; scent; perfume.
- A strong, pervasive quality.
- esteem, Esteem; repute.
- A sports event in which anybody can contest; as, the Australian Open.
- (electronics) a wire that is broken midway.
- The electrician found the in the circuit after a few minutes of testing.
- (transitive) To make something accessible or removing an obstacle to something being accessible
- Turn the doorknob to the door.
- (transitive) To bring up (a topic).
- I don't want to that subject.
- (transitive) To make accessible to customers or clients.
- I will the shop an hour early tomorrow.
- (transitive) To start (a campaign).
- Vermont will elk hunting season next week.
- (intransitive) To become open
- Adjective, open.
adjective (rfc-level, Adjective at L4+ not in L3 Ety section)
- The door opened all by itself.
- (intransitive) To begin conducting business.
- The shop opens at 9:00.
- (context, intransitive, cricket) To begin a side's innings as one of the first two batsmen.
- (context, intransitive, poker) To bet before any other player has in a particular betting round in a game of poker
- After the first two players fold, Julie opens for $5.
- (context, transitive or intransitive, poker) To reveal one's hand.
- Jeff opens his hand revealing a straight flush.
- (not comparable) Which is not closed; accessible; as, an open gate.
- Turn left after the second door.
- 1908, Kenneth Grahame, The Wind in the Willows, Chapter 2
- : The road, the dusty highway...
- (not comparable) Actively conducting or prepared to conduct business.
- Banks are not on bank holidays.
- (comparable) receptive, Receptive.
- I am to new ideas.
- (not comparable) public, Public; as, an open letter, an open declaration.
- He published an letter to the govenor on a full page of the New York Times.
- (not comparable) candid, Candid, ingenuous, not subtle in character:
- The man is an book.
- Of or pertaining to the sensory properties of a particular food or chemical, the taste, colour, odour and feel.
- The organoleptic assessment of the wine showed that it was spoilt
- The climax or peak of sexual pleasure which occurs during sexual activity and which in males may include ejaculation and in females vaginal contractions.
- To have an orgasm.
- (medicine) The surgical fracture of a bone in order to correct a deformity
- (surgery) Of, or relating to osteoplasty.
- the amount of extra oxygen required to oxidize lactic acid in the muscles built up during vigorous exercise