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• (of a door or other opening) slightly open.

• "the home help had left the window ajar"

Similar: slightly open, half open, agape, unfastened, unlatched, unlocked, unsecured, off the latch,

Opposite: closed, wide open,

Origin: late 17th century: from a-2 ‘on’ + obsolete char (Old English cerr ) ‘a turn, return’.

• in a jarring state; unharmonious.

Origin: mid 19th century: from a-2 ‘in, at’ + jar2.