Le tout is a noun meaning "whole" or "all," and is invariable in terms of gender and number, though the
definite article le may
contract or be replaced as usual.
Les éléments forment un tout. The elements make a whole.
le grand Tout the Great Whole (the universe)
mon tout my whole
(in the French game charades)
pas du tout not at all
rien du tout nothing at all
Le tout, c'est de faire vite. The main thing is to be quick about it.
Pronunciation
The noun tout is pronounced [tu].
All about Tout: Introduction | Adjective | Adverb | Noun | Pronoun | Test

