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Origin and history of span
span(n.1)
[distance between two objects] Middle English spanne, a unit of length, from Old English span "distance between the thumb and the middle or little finger of an extended hand" (as a measure of length, roughly nine inches), probably related to Middle Dutch spannen "to join, fasten," from Proto-Germanic *spannan, from PIE root *(s)pen- "to draw, stretch, spin."
The Germanic word was borrowed into Medieval Latin as spannus, hence Italian spanna, Old French espan "hand's width, span as a unit of measure" (Modern French empan), which might have influenced the Middle English word.
As a measure of volume (early 14c.), "what can be held in two cupped hands." The figurative meaning "any short space," especially "period between two points of time" is by 1590s. The sense of "full extent or course over which anything is stretched or prolonged" is by 1630s. The sense of "space between abutments of an arch, etc." is from 1725, variously defined as including the abutments or not. The meaning "maximum lateral dimension of an aircraft" is recorded by 1909.
span(n.2)
"two animals driven together," 1769, American English, from Dutch span, used in this sense, from spannen "to stretch or yoke," from Middle Dutch spannan, cognate with Old English spannan "to join," from Proto-Germanic *spannan, from PIE root *(s)pen- "to draw, stretch, spin," thus a cognate of the verb and span (n.1). Also used in South African English. As a verb, "be matched for funning in harness," 1540s.
span(v.)
Middle English spannen, from Old English spannan "join, link, clasp, fasten, bind, connect; to stretch, spread out" (past tense speonn), from the noun or else from Proto-Germanic *spannan (source also of Old Norse spenna, Old Frisian spanna, Middle Dutch spannen, Dutch spannan "stretch, bend, hoist, hitch," Old High German spannan, German spannen "to join, fasten, extend, connect"), from PIE root *(s)pen- "to draw, stretch, spin" (source also of spin (v.) and of the two nouns span).
Hence "grasp, lay hold of" (late 14c., a sense now obsolete), "measure by means of the outstretched hand" (1550s). The meaning "to encircle with the hand(s)" is by 1781; the transitive sense of "stretch from side to side or end to end of, extend over or across" (something) is by 1630s. Related: Spanned; spanning.
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