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French word demain comes from French de, Latin mane ((early) in the morning Morning.)
de (French)
By (indicates the amount of change). From (used to indicate origin). From (used to indicate the start of a time or range). Of (expresses belonging). Of (indicates an amount). Of (used to express property or association). Used after certain verbs before an infinitive, often translated into English as a gerund or an infinitive. Used attributively, often translated into English as a compound [...]
mane (Latin)
(early) in the morning Morning.
demain (French)
Tomorrow.