Dictionary definition · open
noun
- a clear or unobstructed space or expanse of land or water"finally broke out of the forest into the open"
- where the air is unconfined"he wanted to get outdoors a little"
- a tournament in which both professionals and amateurs may play
- information that has become public"all the reports were out in the open"
verb
- cause to open or to become open"Mary opened the car door"
- start to operate or function or cause to start operating or functioning"open a business"
- become open"The door opened"
- begin or set in action, of meetings, speeches, recitals, etc."He opened the meeting with a long speech"
adjective
- affording unobstructed entrance and exit; not shut or closed"an open door"
- affording free passage or access"open drains"
- with no protection or shield"the exposed northeast frontier"
- open to or in view of all"an open protest"
Source: Open English WordNet (CC BY 4.0).