Etymology: Middle English, from Old English hēah; akin to Old High German hōh high, Lithuanian kaukaras hill
Date: before 12th century
1 a: having large extension upward : taller than average, usual, or expected <a high wall>b: having a specified elevation :tall<six feet high> —often used in combinations <sky-high><waist-high>c: situated or passing above the normal level, surface, base of measurement, or elevation <the high desert> 2 a (1): advanced toward the acme or culmination <high summer>(2): advanced toward the most active or culminating period <on the Riviera during high season>(3): constituting the late, most fully developed, or most creative stage or period <high Gothic>(4): advanced in complexity, development, or elaboration <the higher primates including humans><higher mathematics>b: verging on lateness —usually used in the phrase high timec: long past :remote<high antiquity> 3: elevated in pitch <a high note> 4: relatively far from the equator <high latitude> 5: rich in quality :luxurious<high living> 6: slightly tainted <high game>; also:malodorous<smelled rather high> 7: exalted in character :noble<high purposes> 8: of greater degree, amount, cost, value, or content than average, usual, or expected <high prices> 9: of relatively great importance: as a: foremost in rank, dignity, or standing <high officials>b:serious, grave<high crimes>c: observed with the utmost solemnity <high religious observances>d:critical, climactic<the high point of the novel>e: intellectually or artistically of the first order <high culture>f: marked by sublime, heroic, or stirring events or subject matter <high tragedy><high adventure> 10:forcible, strong<high winds> 11: stressing matters of doctrine and ceremony; specifically:high church 12 a: filled with or expressing great joy or excitement <high spirits>b:intoxicated; also: excited or stupefied by or as if by a drug 13: articulated with some part of the tongue close to the palate <a high vowel>
— high on: enthusiastically in approval or support of
synonymshigh, tall, lofty mean above the average in height. high implies marked extension upward and is applied chiefly to things which rise from a base or foundation or are placed at a conspicuous height above a lower level <a high hill><a high ceiling>. tall applies to what grows or rises high by comparison with others of its kind and usually implies relative narrowness <a tall thin man>. lofty suggests great or imposing altitude <lofty mountain peaks>.