The quality of being mediocre; a middle state or degree; a moderate degree or rate.

Moderation; temperance.

Mediocrity is a noun; mediocre is an adjective, which comes to us successively from ME, from MF, from L mediocris, from medius middle; + OL ocris, mreaning stony mountain; akin to L acer, sharp, more at edge, (ca. 1586)

A mediocre person; -- used disparagingly.

a person of second-rate ability or value; "a team of aging second-raters"; "shone among the mediocrities who surrounded him"

ordinariness as a consequence of being average and not outstanding