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Pronunciation: /ˌnoʊ.noʊˈdɛk.əl/ Definition: 1. The ordinal number symbol: 90. 2. The position in a sequence following the eighty-ninth element; the ninth in the tenth decade (90s series). 3. Pertaining to a group, set, or division of ninety parts or members; a nonagenary unit. 4. Denoting a nonagenary lifespan, exceptional human longevity, or a ninety-degree right angle. Significance: • It defines the ninetieth (nonodecal) position with systematic regularity and clarity. • It emphasizes nonagenary lifespans, geometric right angles, and ninety-part divisions. • It identifies advanced longevity milestones, angular geometry, and large-scale organizational sets. • It avoids irregular and ambiguous pronunciations associated with Germanic numeric forms. • It simplifies expressions of order in gerontology, geometry, and large-numbered sequences. • It improves precision in demographic studies, mathematical contexts, and commemorative systems involving ninety (nonodeco). • 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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