There are 2 definitions of fs in English:

fs1

Syllabification: fs

abbreviation

Femtosecond.

Definition of fs in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude

There are 2 definitions of fs in English:

FS2

Line breaks: FS

Entry from British & World English dictionary

abbreviation

(In the UK) Flight Sergeant.

Definition of fs in: