(=tant) so much
Il travaille tellement. He works so much.
il ne mange pas tellement he doesn't eat much, he doesn't eat all that much
tellement de (quantité)
so much
(nombre)
so many
Il y avait tellement de monde. There were so many people.
Il a tellement mangé que ... He ate so much that ...
Il s'est endormi tellement il était fatigue. He was so tired that he fell asleep.