va·cant 
(vākənt)
(vākənt)adj.
1.
a. Containing nothing; empty: vacant space.
b. Not occupied or put to use: a vacant row of seats.
c. Without an incumbent or occupant; unfilled: a vacant position.
d. Not filled with any activity: vacant hours. See Synonyms at empty.
2. Law Lacking an identified heir: a vacant estate.
3.
a. Lacking intelligence or knowledge: a vacant mind.
b. Lacking expression; blank: a vacant stare.
[Middle English, from Old French, from Latin vacāns, vacant-, present participle of vacāre, to be empty; see euə- in the Appendix of Indo-European roots.]
vacant·ly adv.
vacant·ness n.
- observatory
- observe
- observer
- observingly
- obsess
- obsession
- obsessional
- obsessionally
- obsessive
- obsessive-compulsive
- obsessive-compulsive disorder
- obsessive-compulsive personality disorder
- obsessively
- obsessiveness
- obsessor
- obsidian
- obsolesce
- obsolescence
- obsolescent
- obsolescently
- obsolete
- obsoletely
- obsoleteness
- obsoletism
- obstacle