Once is a measurement of frequency that has someone or something happen the one and only time or someone does an action the one and only time.
"John told his colleagues that he had only be married once."
Ones is the plural form of the symbolic representation of the digit or figure 1. It pluralizes any person, entity or being, a single individual.
"They are the ones I was speaking to you about."
Once is an adverb that means one time, as in
A. “I will only tell you this once”
or
B. “I visited Paris once when I was in my 20s.”
It’s also part of the expression that starts many English children’s books and fables: “Once upon a time…”, which means at some unspecified time long ago.
Ones is the plural of the noun one, and about the only time you will hear it used correctly is when talking about paper money in the U.S. For example, you might withdraw $20 from a bank and say“I’d like two fives and ten ones”, meaning two five-dollar bills and ten one-dollar bills.
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