Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class I. Words Expressing Abstract Relations
Section III. Quantity
2. Comparative Quantity

29. Mean.

   NOUN:MEAN, medium, intermedium [obsoles.], average, balance, normal, rule, run; mediocrity, generality; golden mean &c. (mid-course) [See Mid-course]; middle [See Middle]; compromise [See Compromise]; middle course, middle state; neutrality.
   VERB:AVERAGE, split the difference; take the average &c. n.; reduce to a mean &c. n.; strike a balance, pair off.
   ADJECTIVE:MEAN, intermediate; medial, middle [See Middle]; average, normal, standard; neutral.
  MEDIOCRE, middle-class, bourgeois [F.], commonplace (unimportant) [See Unimportance].
   ADVERB:ON-AN AVERAGE, in the long run; taking one with another, taking all things together, taking it for all in all; communibus annis [L.], in round numbers.
  IN THE MIDDLE, in medias res [L.], meden agan [Greek].
  1. Medium tenuere beati.
  2. Keep the golden mean.—Publius Syrus
  3. Est modus in rebus.—Horace
  4. Give me neither poverty nor riches.—Bible