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solicitous (adj.)[solicitous 词源字典]: 1560s, from Latin sollicitus "restless, uneasy, careful, full of anxiety" (see solicit). Related: Solicitously; solicitousness.[solicitous etymology, solicitous origin, 英语词源]
solicitude (n.): early 15c., from Middle French solicitude (Modern French sollicitude), and directly from Latin sollicitudinem (nominative solicitudo) "anxiety, uneasiness of mind," noun of state from past participle stem of solicitare (see solicit).
solid (adj.): late 14c., "not empty or hollow," from Old French solide "firm, dense, compact," from Latin solidus "firm, whole, undivided, entire," figuratively "sound, trustworthy, genuine," from PIE *sol-ido-, suffixed form of root *sol- "whole" (cognates: Greek holos "whole," Latin salus "health," salvus "safe;" see safe (adj.)).

Meaning "firm, hard, compact" is from 1530s. Meaning "entirely of the same stuff" is from 1710. Of qualities, "well-established, considerable" c. 1600. As a mere intensifier, 1830. Slang sense of "wonderful, remarkable" first attested 1920 among jazz musicians. As an adverb, "solidly, completely," 1650s. Solid South in U.S. political history is attested from 1858. Solid state as a term in physics is recorded from 1953; meaning "employing printed circuits and solid transistors" (as opposed to wires and vacuum tubes) is from 1959. Related: Solidly.
solid (n.): late 14c., "three-dimensional figure," from solid (adj.). Meaning "a solid substance" is from 1690s. Compare also solidus; Latin solidus (adj.) was used as a noun meaning "an entire sum; a solid body."
solidarity (n.): 1829, from French solidarité "communion of interests and responsibilities, mutual responsibility," a coinage of the "Encyclopédie" (1765), from solidaire "interdependent, complete, entire," from solide (see solid (adj.)). With a capital S-, the name of an independent trade union movement in Poland, formed September 1980, from Polish Solidarność.
solidary (adj.): 1818, from French solidaire (16c.), from solide (see solid (adj.)).
solidification (n.): 1800; noun of action from solidify; perhaps from French solidification. Earlier was solidation (1540s).
solidify (v.): 1799 (transitive); 1837 (intransitive), from French solidifier, from Old French solide (see solid (adj.)) + -fier (see -fy). Related: Solidified; solidifying.
solidity (n.): late 14c., from Middle French solidité or directly from Latin soliditatem (nominative soliditas), from solidus (see solid (adj.)).
solidly (adv.): 1610s, "firmly, securely," from solid (adj.) + -ly (2). Meaning "unanimously" is from 1865, American English.
solidus (n.): late 14c., plural solidi, used of both English shilling and Roman gold coin, from Late Latin solidus, an imperial Roman coin (worth about 25 denarii), from nummus solidus, literally "solid coin," properly a coin of thick or solid metal, not of thin plate (see solid (adj.)).
solifidian (n.): "one who believes in salvation by faith alone" (based on Luther's translation of Rom. iii:28), 1590s, Reformation coinage from Latin solus "alone" (see sole (adj.)) + fides "faith" (see faith). As an adjective from c. 1600. Related: Solifidianism
soliloquize (v.): 1759, from soliloquy + -ize. Related: Soliloquized; soliloquizing.
soliloquy (n.): 1610s, from Late Latin soliloquium "a talking to oneself," from Latin solus "alone" (see sole (adj.)) + loqui "speak" (see locution). Also used in translation of Latin "Liber Soliloquiorum," a treatise by Augustine, who is said to have coined the word, on analogy of Greek monologia (see monologue). Related: Soliloquent.
solipsism (n.): 1871, coined from Latin solus "alone" (see sole (adj.)) + ipse "self." The view or theory that self is the only object of real knowledge or the only thing that is real. "The identification of one's self with the Absolute is not generally intended, but the denial of there being really anybody else" [Century Dictionary].
solipsistic (adj.): 1882, from solipsism + -istic. Related: Solipsist; solipsistically.
solitaire (n.): c. 1500, "widow;" 1716, "solitary person, recluse," from French solitaire, from Latin adjective solitarius "alone, lonely, isolated" (see solitary). Sense of "a precious stone set by itself" is from 1727. Meaning "card game played by one person" is first attested 1746.
solitary (adj.): mid-14c., "alone, living alone," from Old French solitaire, from Latin solitarius "alone, lonely, isolated," from solitas "loneliness, solitude," from solus "alone" (see sole (adj.)). Meaning "single, sole, only" is from 1742. Related: Solitarily; solitariness. As a noun from late 14c.; from 1854 as short for solitary confinement (that phrase recorded from 1690s).
solitude (n.): mid-14c., from Old French solitude "loneliness" (14c.) and directly from Latin solitudinem (nominative solitudo) "loneliness, a being alone; lonely place, desert, wilderness," from solus "alone" (see sole (adj.)). "Not in common use in English until the 17th c." [OED]
A man can be himself only so long as he is alone; ... if he does not love solitude, he will not love freedom; for it is only when he is alone that he is really free. [Schopenhauer, "The World as Will and Idea," 1818]
Solitudinarian "recluse, unsocial person" is recorded from 1690s.
solmization (n.): "act of using certain syllables to name tones of a music scale," 1730, from French solmisation, from solmiser, from sol + mi, two of the syllables so used (see gamut).