mediocrity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The state or quality of being mediocre.
• noun Mediocre ability, achievement, or performance.
• noun One that displays mediocre qualities.

from The Century Dictionary.

• noun The character or state of being mediocre; a middle state or degree; a moderate degree or rate; specifically, a moderate degree of mental ability.
• noun Moderation; temperance.
• noun A mediocre person; one of moderate capacity or ability; hence, a person of little note or repute; one who is little more than a nobody.
• noun Synonyms Medium, Average, etc. See mean, n.

from the GNU version of the Collaborative International Dictionary of English.

• noun The quality of being mediocre; a middle state or degree; a moderate degree or rate.
• noun obsolete Moderation; temperance.
• noun A mediocre person; -- used disparagingly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The quality of being intermediate between two extremes; a mean.
• noun obsolete A middle course of action; moderation, balance.
• noun uncountable The condition of being mediocre; having only an average degree of quality, skills etc.; no better than standard.
• noun An individual with mediocre abilities or achievements.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun ordinariness as a consequence of being average and not outstanding
• noun a person of second-rate ability or value