someday - definition and synonyms

adverb 

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/ˈsʌmˌdeɪ/
Someday is often written as two words some day, especially in British English.
  1. at some time in the future even though you do not know when

    Someday I’ll meet the right woman and we’ll get married.

    They dreamed of someday becoming policemen, firemen, or soldiers.