There are 2 definitions of fs in English:

fs

Line breaks: fs

abbreviation

Femtosecond(s).

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar

There are 2 definitions of fs in English:

FS

Line breaks: FS

abbreviation

(In the UK) Flight Sergeant.