Etymology
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Words related to mountain

*men- (2)

Proto-Indo-European root meaning "to project." 

It forms all or part of: amenable; amount; cismontane; demeanor; dismount; eminence; eminent; imminence; imminent; menace; minacious; minatory; mons; montage; montagnard; monte; mount (n.1) "hill, mountain;" mount (v.) "to get up on;" mountain; mountebank; mouth; Osmond; Piedmont; promenade; prominence; prominent; promontory; remount; surmount; ultramontane.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit manya "nape of the neck;" Latin mons "mountain," eminere "to stand out;" Old Irish muin "neck," Welsh mwnwgl "neck," mwng "mane;" Welsh mynydd "mountain." 

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hill (n.)

Old English hyll "hill," from Proto-Germanic *hulni- (source also of Middle Dutch hille, Low German hull "hill," Old Norse hallr "stone," Gothic hallus "rock," Old Norse holmr "islet in a bay," Old English holm "rising land, island"), from PIE root *kel- (2) "to be prominent; hill." Formerly including mountains.

In Great Britain heights under 2,000 feet are generally called hills; 'mountain' being confined to the greater elevations of the Lake District, of North Wales, and of the Scottish Highlands; but, in India, ranges of 5,000 and even 10,000 feet are commonly called 'hills,' in contrast with the Himalaya Mountains, many peaks of which rise beyond 20,000 feet. [OED]
The term mountain is very loosely used. It commonly means any unusual elevation. In New England and central New York, elevations of from one to two thousand feet are called hills, but on the plains of Texas, a hill of a few hundred feet is called a mountain. [Ralph S. Tarr, "Elementary Geology," Macmillan, 1903]
Despite the differences in defining mountain systems, Penck (1896), Supan (1911) and Obst (1914) agreed that the distinction between hills, mountains, and mountain systems according to areal extent or height is not a suitable classification. ["Geographic Information Science and Mountain Geomorphology," 2004]

 Figurative phrase over the hill "past one's prime" is recorded by 1950. Expression old as the hills is recorded by 1819, perhaps echoing Job xv.7. Earlier form old as the hills and the valleys is attested by 1808:

And this is no "new morality." It is morality as old as the hills and the valleys. It is a morality which must be adopted; or, we must confess that there are certain political evils greater than that of seeing one's country conquered. [Cobbett's Weekly Political Register, Feb. 6, 1808]

Cobbett's also had, on April 11, 1818:

However, thus it always is: "those whom God intends to destroy, he first makes foolish," which is a saying as old as the hills between Everly and Marlborough.
montagnard (n.)

"mountaineer, highlander," 1842, from French montagnard, from montagne (12c.; see mountain). In French history, one of the extreme democratic party in the legislatures of the Revolution, supposedly so called because they occupied the highest benches in the National Assembly; hence in later use applied to any French radical or extreme liberal. The French also transferred the word in its literal sense to the aboriginal people of the highlands of South Vietnam (by 1962 in English).

Montana 

U.S. state, from Latinized form of Spanish montaña "mountain" (used in South America specifically of the forested region on the eastern slopes of the Andes), from Latin mont-, stem of mons (see mountain). The territorial name was proposed in 1864 by U.S. Rep. James H. Ashley of Ohio when it was created from Nebraska Territory, in reference to the Rocky Mountains, which however traverse only one end of it. Admitted as a state in 1889. Related: Montanan.

mountaineer (n.)

c. 1600, "native of or dweller in mountains," from mountain + -eer or from French montanier. The verb meaning "to be a mountain-climber" is from 1803 (compare electioneer). Related: Mountaineering

mountainous (adj.)

late 14c., mounteinous, "abounding in or characterized by mountains," from mountain + -ous or else from Medieval Latin montaniosus, from Vulgar Latin *montaneosus "mountainous," from *montanea.