This is the 8673rd most frequent French word.
atterrit
"Atterrit" means "lands" (used for an aircraft or spacecraft).
In this sentence, 'atterrit' is the third person singular form of the verb 'atterrir,' conjugated in the present tense, meaning the airplane is currently landing.
L'avion atterrit sur la piste avec succès.
The airplane lands on the runway successfully.
Here, 'atterrit' describes the action of the bird gently arriving and touching down on the tree, indicating present action.
Quand je regarde par la fenêtre, je vois l'oiseau qui atterrit doucement sur l'arbre.
When I look out the window, I see the bird softly landing on the tree.
In this case, 'atterrit' is used to describe a habitual action where the helicopter lands on the hill every now and then in the present tense.