"one who fasts," c. 1300, agent noun from fast (v.).

"one who drives fast," 1891, agent noun from speed (v.).

large, swift horse," c. 1300, from Old French corsier "fast horse, charger," literally "fast-running," from Vulgar Latin *cursarius, from Latin cursus "a running" (see course (n.)).

1510s, "by the day, in each day," Latin, "by the day," from per (see per) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). As a noun from 1809, "amount or allowance of so much every day."

"to bind up, bandage," 1840 (implied in deligated), from Latin deligatus "bound fast," from deligare "to bind fast," from de- (see de-) + ligare "to bind" (from PIE root *leig- "to tie, bind").

also day-long, "lasting all day," Old English dæglang; see day + long (adj.).

"bedridden," 1630s, from bed (n.) + fast (adj.).

also pay-day, "day when payment is to be made or debts are to be discharged," 1520s, from pay (n.) + day.

1963; see Beatles + mania.

In September [1963], the Beatles played the Royal Albert Hall in London, and in October they had top bill on "Val Parnell's Sunday Night at the Palladium" show. Fans lined up all day on Argyll Street outside the Palladium for a glimpse of the boys, a phenomenon that was unprecedented at that time. Hundreds of extra policemen were called in to deal with the crowd, and some later estimated that as many as 2,000 girls mobbed the band as they tried to enter the theater. ... All major British newspapers headlined the story the next day, and the term "Beatlemania" was coined to describe the frenzy and hysteria that fans exhibited over the Beatles. [Jacqueline Edmondson, "John Lennon: A Biography," 2010]

"period between Ash Wednesday and Easter," late 14c., short for Lenten (n.) "the forty days of fasting before Easter" in the Christian calendar (early 12c.), from Old English lencten "springtime, spring," the season, also "the fast of Lent," from West Germanic *langitinaz "long-days," or "lengthening of the day" (source also of Old Saxon lentin, Middle Dutch lenten, Old High German lengizin manoth). This prehistoric compound probably refers to increasing daylight in spring and is reconstructed to be from *langaz "long" (source of long (adj.)) + *tina- "day" (compare Gothic sin-teins "daily"), which is cognate with Old Church Slavonic dini, Lithuanian diena, Latin dies "day" (from PIE root *dyeu- "to shine").

Compare similar form evolution in Dutch lente (Middle Dutch lentin), German Lenz (Old High German lengizin) "spring." But the Church sense is peculiar to English. The -en in Lenten (n.) was perhaps mistaken for an affix.