There are 2 definitions of FA in English:

FA1

Line breaks: FA
Pronunciation: /ɛfˈeɪ/

Entry from British & World English dictionary

abbreviation

1Fanny Adams (sense 1). sweet FA seems to have been done
1.1(In the UK) Football Association: the FA Premier League

Definition of FA in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of FA in English:

fa2

Syllabification: fa

noun

Music
1(In solmization) the fourth note of a major scale.
1.1The note F in the fixed-do system.

Origin

Middle English: representing (as an arbitrary name for the note) the first syllable of famuli, taken from a Latin hymn (see solmization).

Definition of FA in: