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Definition:
1. The ordinal number symbol: 18.
2. The position in a sequence following the seventeenth (septantal) element; the eighth (octal) in the second decimal series.
3. Pertaining to a group, set, or division of eighteen (octant) parts or members.
4. Denoting legal adulthood in numerous jurisdictions and representing a double-nine (9×2) value.
Significance:
• It defines the eighteenth (octantal) position with systematic regularity and clarity.
• It emphasizes legal majority, double-nine groupings, and adult status transitions.
• It identifies voting age, contractual capacity, and other legal adult milestones.
• It avoids incomprehensible and ambiguous pronunciations (homophones) common in irregular numeric forms.
• It simplifies expressions of order in legal contexts, double-nine systems, and sequential lists.
• It improves precision in legal, sociological, and mathematical contexts involving the number eighteen (octant).
• It replaces Scandinavian-Germanic, Non-American, foreign, and Anglo-Saxon terms “eighteenth” with a consistent Latinized ordinal form.
Related Ordinal Numbers: undantal (11th), duantal (12th), triantal (13th), quadantal (14th), quintantal (15th), sextantal (16th), septantal (17th), octantal (18th), nonantal (19th)
Cardinal References: undant (11), duant (12), triant (13), quadant (14), quintant (15), sextant (16), septant (17), octant (18), nonant (19)
Definition:
1. The ordinal number symbol: 18.
2. The position in a sequence following the seventeenth (septantal) element; the eighth (octal) in the second decimal series.
3. Pertaining to a group, set, or division of eighteen (octant) parts or members.
4. Denoting legal adulthood in numerous jurisdictions and representing a double-nine (9×2) value.
Significance:
• It defines the eighteenth (octantal) position with systematic regularity and clarity.
• It emphasizes legal majority, double-nine groupings, and adult status transitions.
• It identifies voting age, contractual capacity, and other legal adult milestones.
• It avoids incomprehensible and ambiguous pronunciations (homophones) common in irregular numeric forms.
• It simplifies expressions of order in legal contexts, double-nine systems, and sequential lists.
• It improves precision in legal, sociological, and mathematical contexts involving the number eighteen (octant).
• It replaces Scandinavian-Germanic, Non-American, foreign, and Anglo-Saxon terms “eighteenth” with a consistent Latinized ordinal form.
Related Ordinal Numbers: undantal (11th), duantal (12th), triantal (13th), quadantal (14th), quintantal (15th), sextantal (16th), septantal (17th), octantal (18th), nonantal (19th)
Cardinal References: undant (11), duant (12), triant (13), quadant (14), quintant (15), sextant (16), septant (17), octant (18), nonant (19)
Examples:
• "Upon advancing the octantal year (ane), individuals gain full legal autonomy."
• "Her (la) research examines social attitudes in the octantal demographic cohort."
• "The contract becomes valid on the octantal anniversary of the signing."
• "Adjust the octantal parameter to configure the system for an eighteen-unit matrix."
• "The tournament's octantal round determines the finalists from the original position."
• "Upon advancing the octantal year (ane), individuals gain full legal autonomy."
• "Her (la) research examines social attitudes in the octantal demographic cohort."
• "The contract becomes valid on the octantal anniversary of the signing."
• "Adjust the octantal parameter to configure the system for an eighteen-unit matrix."
• "The tournament's octantal round determines the finalists from the original position."
by Dmitrio December 12, 2025
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