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  1. Oxford Dictionary

    n

    • IPA[ɛn]

    英式

    • abbr
      (in units of measurement) nano- (10−9)；neuter.
    • symbol
      an unspecified or variable number

    • noun: n-

    • 釋義

    abbr

    • 1. (in units of measurement) nano- (10−9) 500 ng
    • 2. neuter.
    • 3. normal (denoting straight-chain hydrocarbons)
    • 4. note (used in a book's index to refer to a footnote) 450n
    • 5. noun.

    symbol

    • 1. an unspecified or variable number at the limit where n equals infinity