WordNet sense 1 (the angle (at a particular location) between magnetic north and true north):

magnetic declination, magnetic variation

WordNet sense 2 ((biology) an organism that has characteristics resulting from chromosomal alteration):

mutant, mutation, sport

WordNet sense 3 (an instance of change; the rate or magnitude of change):

fluctuation

WordNet sense 4 (something a little different from others of the same type):

edition, variant, version

WordNet sense 5 ((ballet) a solo dance or dance figure):

pas seul

WordNet sense 6 (an activity that varies from a norm or standard):

variance