も

Common wordFreq.FrequencyTop 100

Meanings

Basic additive particle. In negative sentences, it means 'either'.

both A and B; neither A nor B

Used in the pattern AもBも to list items inclusively. In negative sentences, it means 'neither A nor B'.

even; as many as; no less than

Expresses surprise or emphasis about a quantity or extent, often translatable as 'even' or 'as much as'.

Used in conditional or concessive patterns like 〜ても/でも, meaning 'even if' or 'even though'.

Colloquial adverbial use meaning 'more' or 'another', often in requests or offers. Related to もう.

〈人ひと〉も〈人ひと〉もboth A and B (or, in negatives, neither A nor B)
父ちちも母ははも先せん生せいです。
Both my father and my mother are teachers.
〈数かず〉もas many/much as ... (emphasizing a surprising amount)
彼かれは本ほんを100冊さつも持もっている。
He has as many as 100 books.
〈動どう詞し〉てもeven if (someone does something)
雨あめが降ふっても行いきます。
I'll go even if it rains.

さえ sense 3
さえ also means 'even' but stresses a minimal or extreme example ('even a child could do it'), whereas も with a large number stresses surprising quantity ('as many as 100').
またN5
も is a particle meaning 'also' or 'too' attached to a noun, while また is an adverb/conjunction meaning 'also' or 'again' and can start a clause.
すら
も can mean "even" in a mild, everyday way, whereas すら emphasizes an unexpectedly extreme case, often in negative contexts.

でもN5sense 4
でも is a conjunction/particle meaning 'but' or, after a noun, 'even', while も is the plain additive particle that attaches directly to nouns or the te-form (〜ても) to mean 'also' or 'even if'.
もうN5sense 5
もう is the full adverb meaning 'already' or 'more', while も in casual speech is sometimes heard as a clipped form of もう but is otherwise a completely different particle.
は
は often sets up a contrast between two things, whereas も says the same thing applies equally, without contrast.

Native Japanese particle. The adverbial use is a colloquial shortening of もう.