HOW WORDS MOVE.
HOW MEANINGS MUTATE.

Medieval Latin decimālis passes into French décimal with Romance sound development.

The learned mathematical and proportional sense remains tied to tenths.

Medieval Latin decimālis is formed from Latin decima with an adjectival suffix.

A tenth part or tithe becomes “pertaining to tenths.”

Latin decima is a substantivized feminine form in the decimus/decem family.

The cardinal “ten” supplies a named tenth part or tithe.

Middle English Decembre is respelled December under renewed Latin influence and standardized capitalization.

The month identity remains while its calendar position is twelfth.

Latin December is formed on decem “ten” as a month name.

The numeral ten identifies the tenth month in the early Roman year.

Middle English chek stabilizes as check; the core consonants remain while spelling standardizes.

A chess attack produces stop and restraint, then verification, marks, tokens, and the anti-forgery counterfoil behind the bank sense.

Anglo-French eschec loses its initial unstressed vowel as it enters Middle English chek.

The chess warning expands toward assault, obstruction, and adverse event.

Persian šāh is borrowed into Arabic chess vocabulary with the initial /ʃ/ and long vowel substantially retained.

The sovereign title is specialized as the chess call naming the threatened king.

New Persian šāh continues Middle Persian šāh with the long vowel and final consonant retained.

The title “king” remains stable across the Iranian language stages.

The substantially shorter Middle Persian šāh continues Old Persian xšāyaθiyā; the reviewed record does not invent every unattested intermediate sound change.

The meaning “king, sovereign” remains stable.

Middle English chesse / ches stabilizes as modern chess with final spelling simplification.

The board-game meaning remains stable.

Anglo-French escheks / eschez enters Middle English as chesse, ches, and esches.

The formally plural French game name becomes an English mass/singular game name.

Anglo-French plural forms continue continental Old French eschés with dialectal spelling differences.

Chess pieces or checks become the name of the game as a whole.

Middle English chekmaten / chekmat stabilizes as modern checkmate.

Chess defeat and complete frustration continue together into modern English.

Anglo-French eschec mat is borrowed as Middle English chek mat and supplies the derived verb chekmaten.

The announcement that a king cannot escape becomes both a chess result and complete frustration.

Persian mānd is the verbal adjective associated with māndan.

The action “remain” yields the state “left, at a loss, helpless.”

Persian māndan continues the earlier Iranian base mān- with an infinitival ending.

The meaning “remain, wait” continues.

Persian šāh is borrowed into English as shah with its pronunciation approximated and transliteration simplified.

The sovereign title remains a sovereign title.

Anglo-French eschec mat retains eschec as its first member before English reduction to check.

The threatened king or check supplies the first half of the terminal chess announcement.

Persian šatranj is borrowed into Arabic with the definite article al- and the game-name consonant frame retained.

The game name remains chess.

Persian šatranj continues Middle Persian čatrang with palatal and final-consonant development.

The game name remains chess.

Dutch thee adapts the Southern Min te-type pronunciation with Dutch spelling conventions.

The meaning remains tea.

Modern English ten continues the Middle English spelling with ordinary phonological stabilization.

The cardinal value remains ten while later noun, rating, money, and idiomatic senses branch from it.

Middle English ten continues Old English tīen and tēn with vowel shortening and spelling convergence.

The cardinal meaning remains ten.