Synonyms for open

adjective

• (of textures) full of small openings or gaps
• not defended or capable of being defended
• possibly accepting or permitting
• with no protection or shield
• not sealed or having been unsealed
• openly straightforward and direct without reserve or secretiveness
• affording free passage or view
• ready or willing to receive favorably
• used of mouth or eyes
• open and observable; not secret or hidden
• affording unobstructed entrance and exit; not shut or closed
• not brought to a conclusion; subject to further thought
• accessible to all
• affording free passage or access
• having no protecting cover or enclosure
• not having been filled
• not requiring union membership
• open to or in view of all
• ready for business
• (set theory) of an interval that contains neither of its endpoints
• without undue constriction as from e.g. tenseness or inhibition

verb

• start to operate or function or cause to start operating or functioning
• spread out or open from a closed or folded state
• become available
• afford access to
• become open
• make available
• cause to open or to become open
• begin or set in action, of meetings, speeches, recitals, etc.
• display the contents of a file or start an application as on a computer
• make the opening move

noun

• a clear or unobstructed space or expanse of land or water
• where the air is unconfined
• information that has become public
• a tournament in which both professionals and amateurs may play

• have an opening or passage or outlet