Etymology
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Words related to schedule

shed (v.)
"cast off," Old English sceadan, scadan "to divide, separate, part company; discriminate, decide; scatter abroad, cast about," strong verb (past tense scead, past participle sceadan), from Proto-Germanic *skaithan (source also of Old Saxon skethan, Old Frisian sketha, Middle Dutch sceiden, Dutch scheiden, Old High German sceidan, German scheiden "part, separate, distinguish," Gothic skaidan "separate"), from an extended form of PIE root *skei- "to cut, split."

In reference to animals, "to lose hair, feathers, etc." recorded from c. 1500; of trees losing leaves from 1590s; of clothes, 1858. This verb was used in Old English to gloss Late Latin words in the sense "to discriminate, to decide" that literally mean "to divide, separate" (compare discern). Hence also scead (n.) "separation, distinction; discretion, understanding, reason;" sceadwisnes "discrimination, discretion." Related: Shedding. A shedding-tooth (1799) was a milk-tooth or baby-tooth.
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scheduling (n.)

"the preparation of timetables for complex operations," by 1894, verbal noun from schedule (v.).

sked (n.)
short for schedule, student slang from 1929.
reschedule (v.)

also re-schedule, "replan in accordance with a different timetable," 1912, from re- "back, again" + schedule (v.). Related: Rescheduled; rescheduling.