noun, feminine/di.zɛn/plural: dizaines
dizaine is feminine in French.
a set of ten; about ten; tens (in arithmetic)
“On assure que les gens ordinairement doués sont, après une dizaine de leçons, en état de se diriger convenablement.” — It is assured that ordinarily gifted people are, after about ten lessons, in a position to properly direct themselves.
From dix + -aine.