coincidence

[1]	co-occurrence , happenstance , simultaneity , correspondence , concurrence , consistency , contemporaneity , synchronism , synchrony , coextension , coevality , coinstantaneity
[2]	congruence , matching , jibing , agreement , concord , accord , harmony , accordance , conformity , congruity , consonance , concomitance
[3]	chance occurrence , concurrence , conjunction , fluke , chance , co-occurrence , accident , luck , fortuity , fortuitousness , (US/Canadian) happenstance