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Pronunciation: /ˌkwɪn.toʊˈdɛk.əl/ Definition: 1. The ordinal number symbol: 50. 2. The position in a sequence following the forty-ninth (quadeco-nonal) element; the fifth in the sixth decade (50s series). 3. Pertaining to a group, set, or division of fifty parts or members; a jubilee or semicentennial unit. 4. Denoting a half-century period, golden (aureate) anniversary, or quinquagenary milestone. Significance: • It defines the fiftieth (quintodecal) position with systematic regularity and clarity. • It emphasizes semicentennial celebrations, quinquagenary periods, and fifty-part divisions. • It identifies golden (aureate) anniversaries, jubilee years (anes), and half-century historical markers. • It avoids irregular and ambiguous pronunciations associated with Germanic numeric forms. • It simplifies expressions of order in anniversary, historical, and organizational contexts. • It improves precision in commemorative, demographic, and temporal systems involving the number fifty (quintodeco). • It replaces Scandinavian-Germanic, Non-American, foreign, and Anglo-Saxon terms with a consistent Latinized ordinal form. Related Ordinal Numbers: decal (10th), duodecal (20th), triodecal (30th), quadecal (40th), quintodecal (50th), sextodecal (60th), septodecal (70th), octodecal (80th), nonodecal (90th) Cardinal References: deco (10), duodeco (20), triodeco (30), quadeco (40), quintodeco (50), sextodeco (60), septodeco (70), octodeco (80), nonodeco (90)
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