A Quick and Simple Dictionary

open

1. Adjective.  (not comparable) Which is not closed; accessible; unimpeded; as, an open gate.
2. Adjective.  (not comparable) Actively conducting or prepared to conduct business.
3. Adjective.  (comparable) Receptive.
4. Adjective.  (not comparable) Public; as, an open letter, an open declaration.
5. Adjective.  (not comparable) Candid, ingenuous, not subtle in character:.
6. Adjective.  (mathematics, logic) Having a free variable.
7. Adjective.  (mathematics, topology) Is part of a predefined collection of subsets of $X$, that defines a topological space on $X$.
8. Adjective.  (computing, not comparable) In current use; mapped to part of memory.
9. Verb.  (transitive) To make something accessible or removing an obstacle to something being accessible.
10. Verb.  (transitive) To bring up (a topic).
11. Verb.  (transitive) To make accessible to customers or clients.
12. Verb.  (transitive) To start (a campaign).
13. Verb.  (intransitive) To become open.
14. Verb.  (intransitive) To begin conducting business.
15. Verb.  (intransitive, cricket) To begin a side's innings as one of the first two batsmen.
16. Verb.  (intransitive, poker) To bet before any other player has in a particular betting round in a game of poker.
17. Verb.  (context, transitive) To reveal one's hand.
18. Verb.  (computing, transitive) To load into memory for viewing or editing.
19. Noun.  A sports event in which anybody can contest; as, the Australian Open.
20. Noun.  (electronics) a wire that is broken midway.
21. Noun.  (''with the'') Open or unobstructed space; an exposed location.
22. Noun.  (''with the'') Public knowledge or scrutiny; full view.