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meiosis (n.)[meiosis 词源字典]: "division of a cell nucleus," 1905, from Greek meiosis "a lessening," from meioun "to lessen," from meion "less," from PIE root *mei- (2) "small" (see minus).

Earlier (1580s) it was a rhetorical term, a figure of speech "weak or negative expression used for a positive and forcible one, so that it may be made all the more emphatic," as when one says "not bad" meaning "very good" or "don't mind if I do" meaning "I really would like to," or this example from "Mark Twain":
"YOUNG AUTHOR." -- Yes Agassiz does recommend authors to eat fish, because the phosphorus in it makes brains. So far you are correct. But I cannot help you to a decision about the amount you need to eat,--at least, not with certainty. If the specimen composition you send is about your fair usual average, I should judge that perhaps a couple of whales would be all you would want for the present. Not the largest kind, but simply good, middling-sized whales.
Related: meiotic; meiotically.[meiosis etymology, meiosis origin, 英语词源]
tolerable (adj.): early 15c., "bearable," from Middle French tolerable (14c.) and directly from Latin tolerabilis "that may be endured, supportable, passable," from tolerare "to tolerate" (see toleration). Meaning "moderate, middling, not bad" is recorded from 1540s. Related: Tolerably.