"return, backward movement," 1610s, from Latin recursionem (nominative recursio) "a running backward, return," noun of action from past-participle stem of recurrere "run back" (see recur).
in the mechanical sense "retardation of movement," 1855, from lag (v.). Also noted in Farmer and Henley ("Slang and Its Analogues") as American theatrical slang for "a wait," with an attestation from 1847. First record of lag time is from 1951.
16c. spelling variant or attempted classical correction of Middle English rime "measure, meter, rhythm," also "agreement in end-sounds of words or metrical lines, rhyme; a rhyming poem" (12c.), from Old French rime "verse," from Latin rhythmus "movement in time," from Greek rhythmos "measured flow or movement, rhythm; proportion, symmetry; arrangement, order; form, shape, wise, manner; soul, disposition," related to rhein "to flow" (from PIE root *sreu- "to flow"). Compare rhyme.
The word rhyme has no connection with the word rhythm, nor is rhyme necessary to accentual verse. Nevertheless, rhyme was usually present. On the other hand, in classical Greek metrical poetry, rhymes, if not accidental, were never an essential element of metrical verse structure. [Henry Osborn Taylor, "The Classical Heritage of the Middle Ages," 1911]
The spelling fluctuated 16c.-17c., rithme and ri'me also being used. From 1550s as "metrical movement, movement in time characterized by equality of measures and alteration of stress and relaxation." By 1776 as "regular succession of beats or accents in music."
The rhythm method in reference to birth control is attested from 1936. Rhythm and blues, U.S. music style, is from 1949 (first in Billboard magazine).
"hasten along, move precipitately," 1810, perhaps from hurry-scurry (1732), a reduplication of hurry (v.), or imitative. As a noun, "a hurried movement, fluttering or bustling haste," 1823, from the verb.