WordNet sense 1 (an indefinitely short time):

bit, minute, moment, minute

WordNet sense 2 (a particular point in time):

instant

WordNet sense 3 (1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites):

s, sec

WordNet sense 4 (a 60th part of a minute of arc):

arcsecond

WordNet sense 5 (a speech seconding a motion):

endorsement, indorsement, secondment

WordNet sense 6 (the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle):

second gear

WordNet sense 7 (merchandise that has imperfections; usually sold at a reduced price without the brand name):

irregular

WordNet sense 8 (give support or one's approval to):

back, endorse, indorse

WordNet sense 9 (being or denoting a numerical order in a series):

ordinal

WordNet sense 10 (lying between two extremes in time or space or degree):

intermediate, intermediate

WordNet sense 11 (the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield):

second base

WordNet sense 12 (of the transmission gear causing forward movement in a motor vehicle):

forward

WordNet sense 13 (in the second place):

secondly