no. 1

adjective

Usage: usually capitalized N

: number one

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/num"beuhr wun"/

number one.

[1595-1605]

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No. 1,

Informal.

1. one's own welfare; number one: »

looking out for No. 1.

2. chief; principal; number-one: »

my No. 1 friend.

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↑number one