All has 10 different meanings across 5 categories:
Everything that one is capable of.
Initialism of anterolateral ligament.
In plain English: All is a word used to describe every single thing in a specific group without leaving any out.
"He ate all of his lunch."
Usage: Do not use "all" to refer to the anterolateral ligament in general conversation, as that is a specific medical abbreviation. In everyday English, the word functions only as an adjective or pronoun meaning the whole amount or entire group.
(quantifier) used with either mass or count nouns to indicate the whole number or amount of or every one of a class
"we sat up all night"
"ate all the food"
"all men are mortal"
"all parties are welcome"
All gone; dead.
In plain English: All means every single thing without any exceptions left out.
"All the students finished their homework before lunch."
Usage: Use "all" as an adjective to describe something that has completely disappeared or ceased to exist, often implying that nothing remains of it. This usage typically appears in informal contexts, such as stating that supplies are "all gone" rather than using the more standard phrase "completely gone."
to a complete degree or to the full or entire extent (`whole' is often used informally for `wholly')
"he was wholly convinced"
"entirely satisfied with the meal"
"it was completely different from what we expected"
"was completely at fault"
"a totally new situation"
"the directions were all wrong"
"it was not altogether her fault"
"an altogether new approach"
"a whole new idea"
"she felt right at home"
"he fell right into the trap"
Intensifier.
In plain English: All means completely or totally when used as an adverb to show something is done without any limit or exception.
"I did not see all that much of the movie because I was checking my phone."
Usage: Use "all" before an adjective or verb to strongly emphasize that something is true to a very great degree, such as in "I am all tired." Place it directly before the word you are intensifying rather than at the end of a sentence.
Every individual or anything of the given class, with no exceptions (the noun or noun phrase denoting the class must be plural or uncountable).
Everything.
Although.
The word "all" comes from Old English and Middle English forms of uncertain origin. It may ultimately derive from a Proto-Indo-European root meaning "all.