Use the adverb necessarily to mean inevitably. The best man won't necessarily have to speak at the wedding reception, but he should probably have a speech ready just in case.

Necessarily also means as a logical result or consequence of some action. Your English composition grade is necessarily based on the work you turn in for the class. If you write fairly well, you won't necessarily get an A, but you just might. Necessarily is made up of the Latin roots ne, meaning not, and cedere, meaning yield. The adjective "necessary," from which necessarily comes, originally meant no backing away.

Definitions of necessarily
  1. adverb
    in such a manner as could not be otherwise
    “it is necessarily so”
    synonyms: inevitably, needs, of necessity
  2. adverb
    in an essential manner
    “such expenses are necessarily incurred”
    synonyms: needfully
    see moresee less
    in an unnecessary manner
  3. adverb
    as a highly likely consequence
    “we are necessarily bound for federalism in Europe”
Word Family

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