Definitions
1.nounThe digit or figure 6.
2.noun(by ellipsis of six o'clock) Rear, behind (rear side of something)."cover my six"
3.nounAn event whereby a batsman hits a ball which does not bounce before passing over a boundary in the air, resulting in an award of 6 runs for the batting team.
4.nounA touchdown.
5.nounSmall beer sold at six shillings per barrel.
6.nounA pair of sixes.
7.nounShort for six of one, half a dozen of the other.