There are 2 definitions of is in English:

is1

Line breaks: is
Third person singular present of be.

Definition of is 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 is in English:

IS2

Line breaks: IS

abbreviation

Iceland (international vehicle registration).

Origin

from Icelandic Ísland.