Know how to use "fewer" and "less"? Find out.
"distance between two objects," Old English span "distance between the thumb and little finger of an extended hand," probably related to Middle Dutch spannen "to join, fasten" (see span (n.2)).
The Germanic word was borrowed into Medieval Latin as spannus, hence Italian spanna, Old French espanne, French empan. As a measure of length, roughly nine inches. Meaning "length of time" first attested 1590s; that of "space between abutments of an arch, etc." is from 1725. Meaning "maximum lateral dimension of an aircraft" is first recorded 1909. Attention span is recorded from 1922.
"two animals driven together," 1769, from Dutch span, from spannen "to stretch or yoke," from Middle Dutch spannen, cognate with Old English spannen "to join" (see span (v.)).
Old English spannen "to clasp, fasten, stretch, span," from Proto-Germanic *spanwanan (cf. Old Norse spenna, Old Frisian spanna, Middle Dutch spannen, Old High German spannan, German spannen), from PIE root *(s)pen- "to draw, stretch, spin" (cf. Latin pendere "to hang, to cause to hang," pondus "weight" (the weight of a thing measured by how much it stretches a cord), pensare "to weigh, consider;" Greek ponein "to toil;" Lithuanian spendziu "lay a snare;" Old Church Slavonic peti "stretch, strain," pato "fetter," pina "I span;" Old English spinnan "to spin;" for other cognates, see spin (v.)). The meaning "to encircle with the hand(s)" is from 1781; in the sense of "to form an arch over (something)" it is first recorded 1630s.
Old English spinnan "draw out and twist fibers into thread," from Proto-Germanic *spenwanan (cf. Old Norse and Old Frisian spinna, Danish spinde, Dutch spinnen, Old High German spinnan, German spinnen, Gothic spinnan), from PIE *(s)pen- "stretch" (cf. Armenian henum "I weave;" Greek patos "garment, literally "that which is spun;" Lithuanian pinu "I plait, braid," spandau "I spin;" Middle Welsh cy-ffiniden "spider;" see span (v.)).
Sense of "to cause to turn rapidly" is from 1610s; meaning "revolve, turn around rapidly" first recorded 1660s. Meaning "attempt to influence reporters' minds after an event has taken place but before they have written about it" seems to have risen to popularity in the 1984 U.S. presidential campaign; e.g. spin doctor, first attested 1984. Spinning wheel is attested from c.1400; spinning-jenny is from 1783 (see jenny); invented by James Hargreaves c.1764-7, patented 1770.
"fairly rapid ride," 1856, from spin (v.).
To tell everything one knows; be totally and lengthily candid: ''Can I be perfectly frank with you?'' ''Good. Spill your guts'' (1927+)