/u/
1. General
adverb

where

T'es où ?

Where are you?

Synonyms:où est-ce que, à quel endroit
2. General
adverb

in/at which (place)

when / at which (time)

Le jour où il est arrivé, il neigeait.

The day when he arrived, it was snowing.

Synonyms:quand