adverb
Used adverbially to refer to two items together, often with a verb or adjective. Implies 'both of them' without needing a separate noun.
この二つともください。
I'll take both of these, please.
二つとも同じ値段です。
Both are the same price.
Compound of 二つ (futatsu, 'two things') + とも (tomo, 'both, all'). The とも suffix indicates inclusiveness.