altitude

/al.ti.tyd/
1.
nounfeminineSing

height above sea level

elevation

L'avion a déjà atteint son altitude de croisière.

The plane has already reached its cruising altitude.

Synonyms:hauteur, élévation
2.
nounfeminineSing

high elevation (the condition or environment of being at significant altitude)

On n'a pas l'habitude de marcher en altitude, on s'essouffle vite.

We're not used to hiking at high altitude; we get out of breath quickly.

Synonyms:milieu d'altitude, haute altitude