Etymology
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along (adv., prep.)
Old English andlang "entire, continuous; extended" (adj.); "alongside of" (prep.), from and- "opposite, against" (from Proto-Germanic *andi-, *anda-, from PIE *anti "against," locative singular of root *ant- "front, forehead") + lang "long" (see long (adj.)). Reinforced by Old Norse cognate endlang. Prepositional sense extended in Old English to "through the whole length of." Of position, "lengthwise," c. 1200; of movement, "onward," c. 1300. Meaning "in company, together" is from 1580s. All along "throughout" is from 1690s.
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sing-along 
1959, noun and adjective, from verbal phrase; see sing (v.) + along (adv.). Originally associated with U.S. music producer Mitch Miller (1911-2010).
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get along (v.)
"agree, live harmoniously," 1875, from get (v.) + along (adv.).
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alongshore (adj.)
"existing or employed along a shore or coast," 1779, from along + shore (n.). Compare along-ships (adv.) "lengthwise to the ship" (1680s).
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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.
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endlong (prep., adv.)
c. 1200, "from end to end, lengthwise; through or over the length of," from Old English andlang "from end to end, lengthwise" (see along) with Middle English substitution of ende (see end (n.)) for first element. Meaning "at full length, horizontally" is from early 15c. In Middle English frequently paired with overthwart and together meaning "lengthwise and crosswise," hence "in all directions."
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lone (adj.)

late 14c., "having no companion, solitary, apart from any other," shortening of alone (q.v.) by weakening of stress or else by misdivision of what is properly all one. Used attributively, while the full form is used in the predicate. Compare live (adj.), from alive; colloquial 'long for along. The Lone Star in reference to Texas is first recorded 1843, from its flag when it was a nation. Lone wolf in the figurative sense is 1901, American English.

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*ant- 
Proto-Indo-European root meaning "front, forehead," with derivatives meaning "in front of, before; end." Also see *ambhi-.

It forms all or part of: advance; advantage; along; ancestor; ancient (adj.); answer; Antaeus; ante; ante-; ante meridiem; antecede; antecedent; antedate; antediluvian; ante-partum; antepenultimate; anterior; anti-; antic; anticipate; anticipation; antique; antler; avant-garde; elope; end; rampart; un- (2) prefix of reversal; until; vambrace; vamp (n.1) "upper of a shoe or boot;" vanguard.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit antah "end, border, boundary;" Hittite hanti "opposite;" Greek anta, anten "opposite," anti "over against, opposite, before;" Latin ante (prep., adv.) "before (in place or time), in front of, against;" Old Lithuanian anta "on to;" Gothic anda "along;" Old English and- "against;" German ent- "along, against."
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river-bottom (n.)

"alluvial land along the margin of a river," 1752, American English, from river (n.) + bottom (n.).

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accompanying (adj.)

"going along with, adjoining," by 1782, present-participle adjective from accompany (v.).

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