The Collaborative International Dictionary of English v.0.48:

Ajar \A*jar"\, adv. [OE. on char ajar, on the turn; AS. cerr,
   cyrr, turn, akin to G. kehren to turn, and to D. akerre. See
   Char.]
   Slightly turned or opened; as, the door was standing ajar.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ajar \A*jar"\, adv. [Pref. a- + jar.]
   In a state of discord; out of harmony; as, he is ajar with
   the world.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ajar
    adj 1: slightly open; "the door was ajar"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "ajar":
   agape, clashing, conflicting, confused, dehiscent, gaping, grating,
   harsh, jangling, jangly, jarring, jostling, openmouthed, oscitant,
   ringent, slack-jawed, warring, yawning