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Definition open

Etymology 1

From Middle English open, from Old English open (“open”), from Proto-Germanic *upanaz (“open”), from Proto-Indo-European *upo (“up from under, over”). Cognate with Scots apen (“open”), Saterland Frisian eepen (“open”), West Frisian iepen (“open”), Dutch open (“open”), Low German open, apen (“open”), German offen (“open”), Danish åben (“open”), Swedish öppen (“open”), Norwegian Bokmål åpen (“open”), Norwegian Nynorsk open (“open”), Icelandic opinn (“open”). Compare also Latin supinus (“on one's back, supine”), Albanian hap (“to open”). Related to up.

Adjective

open (comparative more open, superlative most open)

1. (not comparable) Not closed; accessible; unimpeded.
2. Not drawn together, closed, or contracted; extended; expanded.
3. (not comparable) Actively conducting or prepared to conduct business.
4. (comparable) Receptive.
5. (not comparable) Public
6. (not comparable) Candid, ingenuous, not subtle in character.
7. (mathematics, logic, of a formula) Having a free variable.
8. (mathematics, topology, of a set) Which is part of a predefined collection of subsets of ${\displaystyle X}$, that defines a topological space on ${\displaystyle X}$.
9. (graph theory, of a walk) Whose first and last vertices are different.
10. (computing, not comparable, of a file, document, etc.) In current use; mapped to part of memory.
11. (business) Not fulfilled.
12. Not settled or adjusted; not decided or determined; not closed or withdrawn from consideration.
13. (music, stringed instruments) Of a note, played without pressing the string against the fingerboard.
14. (music, wind instruments) Of a note, played without closing any finger-hole, key or valve.
15. Not of a quality to prevent communication, as by closing waterways, blocking roads, etc.; hence, not frosty or inclement; mild; used of the weather or the climate.
16. (law) (Of correspondence) Written or sent with the intention that it may made public or referred to at any trial, rather than by way of confidential private negotiation for a settlement. (Opposite of "without prejudice")
17. (phonetics) Uttered with a relatively wide opening of the articulating organs; said of vowels.
18. (phonetics) Uttered, as a consonant, with the oral passage simply narrowed without closure.
19. (phonetics, of a syllable) That ends in a vowel; not having a coda.
20. (computing) Made public, usable with a free licence.
21. (medicine) Resulting from an incision, puncture or any other process by which the skin no longer protects an internal part of the body.