From The Collaborative International Dictionary of English v.0.48 [gcide]:
100 \100\ adj.
1. the Arabic numerals representing the number one hundred;
denoting a quantity consisting of one more than ninety
nine and one less than one hundred and one; ten times ten
Syn: hundred, a hundred, one hundred, c
[WordNet 1.5 +PJC]
From WordNet (r) 3.0 (2006) [wn]:
100
adj 1: being ten more than ninety [syn: hundred, {one
hundred}, 100, c]
n 1: ten 10s [syn: hundred, 100, C, century, one C]