number 1

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Noun1.number 1 - the first element in a countable series; "the first of the month"
no., ordinal, ordinal number - the number designating place in an ordered sequence
References in periodicals archive ?
has taken a fresh look at Fibonacci numbers and unexpectedly discovered a new mathematical constant: the number 1.
Do Wah Diddy Diddy,'' Manfred Mann (Ascot; number 1, 1964).