Entry Definition
first, first one; (baseball) first batter, first base
s/he, it is first, is the first one; (competitor) s/he comes in first; (baseball) s/he plays first base
s/he steals; (baseball) s/he steals base
second (in sequence); second one, second instance or occurrence; (baseball, inanimate) second base
s/he, it is second, is the second one; (competitor) s/he comes in second; (baseball) s/he plays second base
third (in sequence); third one, third instance or occurrence; (baseball, inanimate) third base
s/he, it is third, is the third one; (competitor) s/he comes in third; (baseball) s/he plays third base
fort, fortress, military base; defensive armor