Usage Note
dizaine is a collective approximate number meaning 'about ten' — like une dizaine de personnes ('about ten people'). It differs from dix (exact). Similarly: une douzaine ('a dozen'), une centaine ('about a hundred'). These approximate collectives are very common in spoken French.
Examples
"Une dizaine de personnes attendaient dehors."
Natural Translation
About ten people were waiting outside.
Literal Translation
A ten-ish of people were waiting outside.

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