Logo
dictionary thesaurus

si

noun
\ ˈsē How to pronounce si (audio) \

Definition of si

 (Entry 1 of 3)

: ti entry 1

Si

symbol

Definition of Si (Entry 2 of 3)

silicon

SI

abbreviation

Definition of SI (Entry 3 of 3)

International System of Units

First Known Use of si

Noun

1728, in the meaning defined above

History and Etymology for si

Noun

Italian

Abbreviation

French Système International d'Unités

Keep scrolling for more

Keep scrolling for more

More Definitions for si

Si

symbol

Medical Definition of Si

 (Entry 1 of 2)

silicon

SI

abbreviation

Medical Definition of SI (Entry 2 of 2)

International System of Units

History and Etymology for si

Abbreviation

French Système International d'Unités

WORD OF THE DAY

simulacrum

play

See Definitions and Examples

Get Word of the Day daily email!