There are 3 definitions of -a in English:

-a1

suffix

Forming:
1Ancient or Latinized modern names of animals and plants: primula
2Names of oxides: baryta
3Geographical names: Africa
4Ancient or Latinized modern feminine forenames: Lydia
5Nouns from Italian, Portuguese, and Spanish: duenna stanza

Origin

representing a Greek, Latin, or Romance feminine singular.

Definition of -a in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day abjure
Pronunciation: abˈjo͝or
verb
solemnly renounce (a belief, cause, or claim)

There are 3 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).
2In names (often from modern Latin) of zoological groups: Insectivora

Definition of -a in:

There are 3 definitions of -a in English:

-a3

suffix

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

Origin

representing a casual pronunciation.

Definition of -a in: