Wordnet 3.0
ADVERB (1)
1.
perhaps;
indicating possibility of being more remarkable (greater or better or sooner) than;
- Example: "will yield 10% if not more"- Example: "pretty if not actually beautiful"- Example: "let's meet tonight if not sooner"
WordNet (r) 3.0 (2006):
if not
adv 1: perhaps; indicating possibility of being more remarkable
(greater or better or sooner) than; "will yield 10% if
not more"; "pretty if not actually beautiful"; "let's
meet tonight if not sooner"