There are 2 definitions of JA in English:

JA1

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Entry from British & World English dictionary

abbreviation

Jamaica (international vehicle registration).

Definition of JA in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of JA in English:

ja2

Line breaks: ja

Entry from British & World English dictionary

exclamation

informal
South African term for yes. ‘Let’s go swimming.’ ‘Ja!’ ja, this is the life!

Origin

Dutch.

Phrases

ja well

Used as an expression of embarrassment, apology, or world-weariness: ja well, you’ve seen it all

ja well no fine

Used to express a non-committal, resigned, or ironical attitude.

Definition of JA in: