specialyoudaoicibaDictYouDict[special 词源字典]
special: [13] Latin speciēs originally denoted the ‘outward aspect’, the ‘look’ of something (it was derived from specere ‘look’, source of English spectacle, spectator, spy, etc). It later evolved metaphorically to ‘type, kind’, and in that sense was adopted by English as species [16] (spice is ultimately the same word). From it was derived the adjective speciālis ‘of a particular type’, which has given English special (especial [14] came via Old French especial). Other derivatives have given English specific [17], specify [13], specimen [17], and specious [17] (from Latin speciōsus ‘good-looking’).
=> spectacle, spectator, spice, spy[special etymology, special origin, 英语词源]
special (adj.)youdaoicibaDictYouDict
c. 1200, "better than ordinary," from Old French special, especial "special, particular, unusual" (12c., Modern French spécial) and directly from Latin specialis "individual, particular" (source also of Spanish especial, Italian speziale), from species "appearance, kind, sort" (see species).

Meaning "marked off from others by some distinguishing quality" is recorded from c. 1300; that of "limited as to function, operation, or purpose" is from 14c. Special effects first attested 1951. Special interests in U.S. political sense is from 1910. Special pleading first recorded 1680s, a term that had a sound legal meaning once but now is used generally and imprecisely. Special education in reference to those whose learning is impeded by some mental or physical handicap is from 1972.
special (n.)youdaoicibaDictYouDict
"sweetheart, lover; special person or thing," c. 1300, from special (adj.) or from noun use of the adjective in Old French. Meaning "special train" is attested from 1866.