Etymology
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sage (adj.)

"wise, judicious, prudent," c. 1300 (late 12c. as a surname), from Old French sage "wise, knowledgeable, learned; shrewd, skillful" (11c.), from Gallo-Roman *sabius, from Vulgar Latin *sapius, from Latin sapere "have a taste, have good taste, be wise" (from PIE root *sap- "to taste;" see sap (n.1)). Originally of persons, but that use is now poetic only or archaic; of advice, etc., "characterized by wisdom" is from 1530s. Related: Sageness.

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sage (n.1)

kind of shrubby, aromatic herb (Salvia officinalis), esteemed formerly as a medicine, also used as a condiment, early 14c., from Old French sauge (13c.), from Latin salvia, from salvus "healthy" (from PIE root *sol- "whole, well-kept"). So called for the healing or preserving qualities attributed to it (sage was used to keep teeth clean and relieve sore gums and boiled in water to make a drink to alleviate arthritis). In English folklore, sage, like parsley, is said to grow best where the wife is dominant. The word was in late Old English as salvie, directly from Latin. Compare German Salbei, also from Latin.

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sage (n.2)

"wise man, man of profound wisdom, venerable man known as a grave philosopher," mid-14c., from sage (adj.). Originally applied to the Seven Sages — Thales, Solon, Periander, Cleobulus, Chilon, Bias, and Pittacus — men of ancient Greece renowned for practical wisdom.

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sagely (adv.)

"wisely, with just discernment and prudence," c. 1400, from sage (adj.) + -ly (2).

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salvia (n.)

genus name of a large and diverse group of plants including the garden sage, 1844, from Latin salvia "the plant sage" (see sage (n.1)).

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sagacious (adj.)

c. 1600, "keenly perceptive, discerning," originally of persons in reference to the sense of smell," with -ous + stem of Latin sagax "of quick perception" (see sagacity). The sense of "skilled at discovering truths," especially as regards human natures, is by 1640s. It is not considered to be etymologically related to sage (adj.). Related: Sagaciously; sagaciousness.

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sagebrush (n.)

collective name for a type of dry, shrubby plant that grows over the vast dry plains of the western U.S., by 1846, from sage (n.1), to which it has no biological affinity, + brush (n.2). Said to be so called for resemblance of its appearance or odor.

Sage-brush is very fair fuel, but as a vegetable it is a distinguished failure. Nothing can abide the taste of it but the jackass and his illegitimate child, the mule. ["Mark Twain," "Roughing It"]
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*sol- 

also solə-, Proto-Indo-European root meaning "whole, well-kept." 

It forms all or part of: catholic; consolidate; consolidation; holism; holo-; holocaust; Holocene; hologram; holograph; insouciant; safe; safety; sage (n.1) kind of herb; salubrious; salutary; salute; salvage; salvific; salvo "simultaneous discharge of guns;" save (v.) "deliver from danger;" save (prep.) "except;" solder; soldier; solemn; solicit; solicitous; solid; solidarity; solidity; sou.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sarvah "uninjured, intact, whole;" Avestan haurva- "uninjured, intact;" Old Persian haruva-; Greek holos "whole;" Latin salvus "uninjured, in good health, safe," salus "good health," solidus "solid;" Armenian olj "whole, healthy."  

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maharishi (n.)

Hindu sage or holy man, 1785, from Sanskrit, from maha "great" (from PIE root *meg- "great") + rishi "inspired sage." In general use, a title for a popular spiritual leader.

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Kashmir 

formerly also Cashmere, 1747, from Sanskrit Kashypamara "land of Kashyap," said to be the name of a renowned sage. As a type of carpet, from 1900. Related: Kashmiri (1832); Kashmirian.

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