n. 平均, 平坦, 平等

[化] 平直度; 均匀性

Evenness \E"ven*ness\, n.
The state of being ven, level, or disturbed; smoothness;
horizontal position; uniformity; impartiality; calmness;
equanimity; appropriate place or level; as, evenness of
surface, of a fluid at rest, of motion, of dealings, of
temper, of condition.

It had need be something extraordinary, that must
warrant an ordinary person to rise higher than his own
evenness. --Jer. Taylor.