- The definition of ajar refers to something that is slightly opened.
Leaving a shoe in the doorway so that is will not shut is an example of a door being ajar.
This door is ajar.
ajar definition by Webster's New World
Origin: Middle English on char, a-char ; from Old English cier, a turn: see chore
Origin: a- plush jar
ajar definition by American Heritage Dictionary
adverb & adj.
Origin: Middle English on char : on, in; see on + char, turn (from Old English cierr).