Etymology
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Words related to side

soiree (n.)
"an evening party," 1793, from French soirée, from soir "evening," from Old French soir "evening, night" (10c.), from Latin sero (adv.) "late, at a late hour," from serum "late hour," neuter of serus "late," from PIE *se-ro-, suffixed form of root *se- (2) "long, late" (source also of Sanskrit sayam "in the evening," Lithuanian sietuva "deep place in a river," Old English sið "after," German seit "since," Gothic seiþus "late," Middle Irish sith, Middle Breton hir "long"). For suffix, compare journey.
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countryside (n.)

"section of a country, piece of land," mid-15c., perhaps literally "one side of a country," from country + side (n.); hence, "any tract of land having a natural unity" (1727). Meaning "inhabitants of a district or section" is from 1840.

A 

first letter of the Roman alphabet, based on Greek alpha (see alpha). In music from c. 1600 as the name of the sixth note of the natural scale; it is the note given by a fixed-tone instrument (usually oboe or organ) to which all the instruments of an orchestra are tuned. As a blood type, 1926, denoting A agglutinogens. The A side of a two-sided record (by 1962, see side (n.)) held the material chosen for promotion. A-bomb, short for atom bomb, was in newspaper headlines by Aug. 8, 1945.

alongside (adv.)
1707, "parallel to the side of," contraction of the prepositional phrase; see along + side (n.). Originally mostly nautical. As a preposition from 1793.
aside (adv.)
c. 1300, "off to one side;" mid-14c., "to or from the side;" late 14c., "away or apart from a normal direction or position, out of the way," from a- (1) "on" + side (n.). Noun sense of "words spoken so as to be (supposed) inaudible" is from 1727. Middle English had asidely "on the side, indirectly" (early 15c.) and asideward "sideways, horizontal" (late 14c.). Used colloquially as a preposition from 1590s.
backside (n.)
"the rear part of anything," c. 1400, from back (adj.) + side (n.). In the specific sense of "rump of an animal, buttocks" it is recorded by c. 1500.
bedside (n.)
"position by a bed," usually in reference to attendance on one confined in bed, mid-15c., bedsyde, from late 14c. as two words, beddes side, from genitive of bed (n.) + side (n.). Bedside manner attested from 1848.
beside (prep., adv.)
c. 1200, from Old English be sidan "by the side of" (only as two words), from be- + sidan dative of side (n.). By 1200 as one word and used as both adverb and preposition. The alternative Middle English meaning "outside" is preserved in beside oneself "out of one's wits" (late 15c.).
broadside (n.)
"side of a ship" (technically, "the side of a ship above the water, between the bow and the quarter"), 1590s, from broad (adj.) + side (n.); thus "the artillery on one side of a ship all fired off at once" (1590s, with figurative extensions). Two words until late 18c.

Of things other than ships, 1630s. But oldest-recorded sense in English is "sheet of paper printed only on one side" (1570s). As an adverb by 1870; as an adjective by 1932. As a verb from 1930, "to skid sideways" (intransitive); transitive sense "to strike broadside, collide with the side of" is by 1970.
dayside (n.)

"part of a newspaper's staff that works during the day," by 1942, American English, from day (n.) + side (n.).