The difference between 121 and One-to-one

When used as adjectives, 121 means one-to-one, whereas one-to-one means matching each member of one set with exactly one member of another set.


One-to-one is also noun with the meaning: a personal relationship between two people.

check bellow for the other definitions of 121 and One-to-one

  1. 121 as an adjective (informal):

    One-to-one.

  1. One-to-one as an adjective:

    Matching each member of one set with exactly one member of another set.

    Examples:

    "There is a one-to-one relationship between days with large cash shortages and his workdays."

  2. One-to-one as an adjective (chiefly, UK):

    Involving direct communication between two people.

  3. One-to-one as an adjective (mathematics, of a function):

    Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.

  1. One-to-one as a noun:

    A personal relationship between two people.

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