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
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121 as an adjective (informal):
One-to-one.
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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."
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One-to-one as an adjective (chiefly, UK):
Involving direct communication between two people.
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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.
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One-to-one as a noun:
A personal relationship between two people.