30

from the GNU version of the Collaborative International Dictionary of English.

• adjective one more than twenty-nine; three times ten; denoting a quantity consisting of thirty items or units; -- representing the number thirty as an Arabic numeral.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The cardinal number thirty.
• noun tennis score after a player has scored two points in a game

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective being ten more than twenty
• noun the cardinal number that is the product of ten and three