subjects - Term used for the number of items in a singular or plural noun or sentence

Can anyone confirm the name of the term used
for the number of items in the terms singular,
plural, etc.?

Does singular or plural indicate the cardinality
of a part of the sentence, or is there a more
appropriate word for the term cardinality?

E.G. When "We went to the store" has a plural subject, does plural
refer to the cardinality of the subject,

or is a different word used to refer to the
fact that the count is more than one?

Answer

The word you are looking for is plurality.

1 the fact or state of being plural : some languages add an extra syllable to mark plurality. (NOAD)