meiosis (Noun) — (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants).
meiosis (Noun) — Understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary). ex. "saying 'I was not a little upset' when you mean 'I was very upset' is an example of meiosis"