triodecal

Pronunciation: /ˌtraɪ.oʊˈdɛk.əl/
Definition:
1. The ordinal number symbol: 30.
2. The position in a sequence following the twenty-ninth element; the third (trial) in the fourth (quadal) decade (30s series).
3. Pertaining to a group, set, or division of thirty (triodeco) parts or members; a month's standard duration.
4. Denoting a complete unit of thirty (triodeco) days, or a standard temporal division in calendars and scheduling.

Significance:
• It defines the thirtieth (triodecal) position with systematic regularity and clarity.
• It emphasizes monthly cycles, tricenary groupings, and thirty-part divisions.
• It identifies standard month lengths, tricennial periods, and systematic thirty-unit sets.
• It avoids irregular and ambiguous pronunciations associated with Germanic numeric forms.
• It simplifies expressions of order in calendrical, temporal, and organizational contexts.
• It improves precision in scheduling, historical periods, and quantitative systems involving the number thirty (triodeco).
• 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)

Examples:
• "The payment is due on the triodecal day of each month."
• "The study observed participants over a triodecal period to assess longitudinal effects."
• "Adjust the triodecal parameter to align with the thirty-day billing cycle."
• "The assembly line completes a triodecal unit batch every hour."
• "This marks the organization's triodecal anniversary since its founding."

triodecal by Dmitrio December 13, 2025

tridecalogism

A thirteen-letter word that means 'thirteen letter word', from Scott Westerfeld's "The Secret Hour".

"Deliciousness", "overzealously", "fossilization" and "hypochondriac" are all tridecalogisms.

tridecalogism by Lindsey Suzanne March 18, 2006

tridecadal 

Function: adjective
Etymology: tri- + decadal
: of or belonging to thirty years

He's turning tridecadal this Friday!

tridecadal by Eugene M. Kim July 9, 2005

tridecagram

a thriteen pointed star

i have a tridecagram necklace

tridecagram by katelynn norton September 17, 2007

tridecaphobia 

The fear of the number 13. Anything involving 13 is considered frightening. This is used many times to refer to the class of 2013, seeing as it is the best and feared by all the rest.

The class of 2013 scares me because I've never seen any class that amazing; I must have tridecaphobia.

tridecaphobia by CLASS of oh one three lovaaaa. November 13, 2011

Triducal 

Triducal is a moderator in the well known discord server called starving artists. Triducal has a fox as his profile picture but from away, it looks like Freddy Fazbear from five nights at freddy's a well known video game from 2013.

Triducal is really acitve

Triducal by TonyLeFunny April 21, 2022

triodeco

Pronunciation: /ˌtraɪ.oʊˈdɛ.koʊ/
Definition:
1. The cardinal number symbol: 30.
2. A group, set, or series of thirty humans or entities: a tricenary or standard monthly unit.
3. A common temporal unit representing the number of days in a standard month.
4. Denoting a structure or period based on thirty (triodeco) components, such as a calendar month or a trental.

Significance:
• It defines the quantity thirty with systematic regularity and clarity.
• It emphasizes monthly cycles, tricenary units, and temporal divisions.
• It identifies days in a standard month, a traditional "month's mind" memorial period, and any grouping of three tens.
• It avoids irregular and ambiguous pronunciations associated with Germanic numeric forms.
• It simplifies expressions of monthly durations, tricenary groupings, and temporal benchmarks.
• It improves precision in descriptions of scheduling, calendar periods, and standard quantitative units.
• It replaces Scandinavian-Germanic, Non-American, foreign, and Anglo-Saxon terms, similar to replacing "thirty" with a consistent Latinized cardinal form.
Cardinal number: triodeco (30)
Ordinal number: triodecal (30th)
Adjective: triodecal

Examples:
• "The payment is due within a triodeco days from the invoice date."
• "The project's primary phase will last approximately one triodeco."
• "The committee congregates every triodeco to review progress."
• "She completed a triodeco of daily exercises without interruption."
• "The rental agreement specifies a minimum stay of one triodeco."

triodeco by Dmitrio January 22, 2026