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 neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal

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: