| noun | an instance of change; the rate or magnitude of change |
| noun | an activity that varies from a norm or standard “any variation in his routine was immediately reported” |
| noun | a repetition of a musical theme in which it is modified or embellished |
| noun | something a little different from others of the same type “an experimental version of the night fighter” |
| noun | an artifact that deviates from a norm or standard “he patented a variation on the sandal” |
| noun | the angle (at a particular location) between magnetic north and true north |
| noun | the process of varying or being varied |
| noun | (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon) |
| noun | (biology) an organism that has characteristics resulting from chromosomal alteration |
| noun | (ballet) a solo dance or dance figure |
| noun | the act of changing or altering something slightly but noticeably from the norm or standard “who is responsible for these variations in taxation?” |
| vary | verb | be subject to change in accordance with a variable |
| fluctuate | verb | move or sway in a rising and falling or wavelike pattern |
| variant | adjective | differing from a norm or standard |
| mutant | adjective | tending to undergo or resulting from mutation |
| mutate | verb | undergo mutation |
| mutational | adjective | of or relating to or resulting from mutation |