school (1) Look up school at Dictionary.com
"place of instruction," O.E. scol, from L. schola, from Gk. skhole "school, lecture, discussion," also "leisure, spare time," originally "a holding back, a keeping clear," from skhein "to get" + -ole by analogy with bole "a throw," stole "outfit," etc. The original notion is "leisure," which passed to "otiose discussion," then "place for such." The PIE base is *segh- "to hold, hold in one's power, to have" (see scheme). The L. word was widely borrowed, cf. O.Fr. escole, Fr. école, Sp. escuela, It. scuola, O.H.G. scuola, Ger. Schule, Swed. skola, Gael. sgiol, Welsh ysgol, Rus. shkola. Replaced O.E. larhus "lore house." Meaning "students attending a school" is attested from c.1300; sense of "school building" is first recorded c.1590. Sense of "people united by a general similarity of principles and methods" is from 1612; hence school of thought (1864). The verb is attested from 1573. School of hard knocks "rough experience in life" is recorded from 1912 (in George Ade); to tell tales out of school "betray damaging secrets" is from 1546. Schoolmarm is attested from 1831, U.S. colloquial; used figuratively for "patronizingly and priggishly instructing" from 1887.
school (2) Look up school at Dictionary.com
"group of fish," c.1400, from M.Du. schole "group of fish or other animals," cognate with O.E. scolu "band, troop, school of fish," from W.Gmc. *skulo- (see shoal (2)).