There are 3 main definitions of -a in English:

-a1

suffix

Forming:
5Nouns from Italian, Portuguese, and Spanish: duenna stanza

Origin

representing a Greek, Latin, or Romance feminine singular.

Definition of -a in:

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There are 3 main definitions of -a in English:

-a2

suffix

Forming plural nouns:
1From Greek or Latin neuter plurals corresponding to a singular in -um or -on (such as addenda, phenomena).

Definition of -a in:

There are 3 main definitions of -a in English:

-a3

suffix

informal
1Of: coupla
2Have: mighta
3To: oughta

Origin

representing a casual pronunciation.

Definition of -a in: