1.  plurality(n = noun.state) - the state of being plural; "to mark plurality, one language may add an extra syllable to the word whereas another may simply change the vowel in the existing final syllable"
is a kind of state
Derived form adjective plural₂

2.  plurality(n = noun.quantity) battalion, large number, multitude, pack - a large indefinite number; "a battalion of ants"; "a multitude of TV antennas"; "a plurality of religions"
is a kind of large indefinite amount, large indefinite quantity

3.  plurality(n = noun.quantity) relative majority - (in an election with more than 2 options) the number of votes for the candidate or party receiving the greatest number (but less that half of the votes);
is a kind of relative quantity

1.  The state of being plural, or consisting of more than one; a number consisting of two or more of the same kind; as, a plurality of worlds; the plurality of a verb. [1913 Webster]

2.  The greater number; a majority; also, the greatest of several numbers; in elections, the excess of the votes given for one candidate over those given for another, or for any other, candidate. When there are more than two candidates, the one who receives the plurality of votes may have less than a majority. See Majority. [1913 Webster]
"Take the plurality of the world, and they are neither wise nor good." [1913 Webster]

3.  See Plurality of benefices, below. [1913 Webster]

plurality, n. (pl. -ies)
1 the state of being plural.
2 = PLURALISM 1.
3 a large or the greater number.
4 US a majority that is not absolute.

Etymology:
ME f. OF pluralit{eacute} f. LL pluralitas (as PLURAL)

N  plurality, a number, a certain number, one or two, two or three, a few, several, multitude, majority, multitude, plural, more than one, upwards of, some, several, a few, certain, not alone, et cetera, etc, among other things, inter alia, non deficit alter.