WordNet sense 1 (an indefinitely short time):

bit, moment, second

WordNet sense 2 (a particular point in time):

instant

WordNet sense 3 (a unit of time equal to 60 seconds or 1/60th of an hour):

min

WordNet sense 4 (a unit of angular distance equal to a 60th of a degree):

arcminute, minute of arc

WordNet sense 5 (distance measured by the time taken to cover it):

hour

WordNet sense 6 (immeasurably small):

atomic, atomlike

WordNet sense 7 (too small to be seen except under a microscope):

microscopic, microscopical

WordNet sense 8 (infinitely or immeasurably small):

infinitesimal

WordNet sense 9 (limited or below average in number or quantity or magnitude or extent):

little, small

WordNet sense 10 (characterized by painstaking care and detailed examination):

narrow

WordNet sense 11 (exercising caution or showing care or attention):

careful