different between mediocrities vs mediocrity

English

mediocrities

From Middle French médiocrité, from Latin mediocrit?s, from mediocris.

mediocrity (countable and uncountable, plural mediocrities)

(now rare) The quality of being intermediate between two extremes; a mean.
(obsolete) A middle course of action; moderation, balance.
- , New York Review Books 2001, p.273:
  In adversity I wish for prosperity, and in prosperity I am afraid of adversity. What mediocrity may be found?
(uncountable) The condition of being mediocre; having only an average degree of quality, skills etc.; no better than standard.
An individual with mediocre abilities or achievements.

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