Formal/literary particle meaning 'even'. Attaches to nouns or nominalized phrases. Often used in negative or concessive contexts.
Even a child knows that.
Formal/literary particle introducing a concessive clause. Follows a verb or adjective in the て-form or a noun + とて.
with the purpose of; in order to
Formal/literary particle expressing purpose. Follows a verb in the volitional form or a noun expressing intention. Rare in modern Japanese.
Even if you hurry, you won't make it in time.
As it is a child's doing, please forgive him.
He went to the library in order to study.
Derived from the particle と combined with the conjunctive particle て. The exact historical development is uncertain, but it functions as a formal/literary compound particle.