mach number ( synonym found)
Definition of mach number:

°An abstract entity used to describe quantity.
"Zero, one, -1, 2.5, and pi are all numbers."
°A numeral: a symbol for a non-negative integer.
"The number 8 is usually made with a single stroke."
°To label (items) with numbers; to assign numbers to (items).
°To total or count; to amount to.
"I don't know how many books are in the library, but they must number in the thousands."
Definition of mach number:

°An abstract entity used to describe quantity.
"Zero, one, -1, 2.5, and pi are all numbers."
°A numeral: a symbol for a non-negative integer.
"The number 8 is usually made with a single stroke."
°To label (items) with numbers; to assign numbers to (items).
°To total or count; to amount to.
"I don't know how many books are in the library, but they must number in the thousands."
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