820 canonical forms + 578 route stages.
THE TIMELINE ATLAS
JOURNEY ATLAS ↗FORM / ROUTE / BOUND
1398 REVIEWED EVENTSLANGUAGE
IN TIME.
One cross-word chronology for every defensibly bounded form and journey stage—without converting a vague historical label into a fake year.
A reviewed graph bound, not a claim of an earliest human word.
Only stages with directly cited numeric bounds enter this atlas.
Labels remain visible in Journey Atlas, but not parsed into false years.
003 MATCHING EVENTS
FILTER THE CHRONOLOGY
WHEN DID THE EVIDENCE LAND?
TWO CLOCKS.
NO FALSE PRECISION.
FORM CHRONOLOGY dates a canonical linguistic form or reconstruction in the lexical graph.
ROUTE CHRONOLOGY dates a geographic or transmission stage in a word’s journey.
They can share an era band, but they are never silently treated as the same kind of claim.
CROSS-WORD CHRONOLOGY / EARLIEST BOUND FIRST
THE EVIDENCE IN TIME
Medieval2 ON THIS PAGE
800 CE–850 CEcirca
ROUTE STAGEBaghdad
algebra
c. 825
Al-jabr appears in the title and method vocabulary of al-Khwārizmī's work.
1 EVIDENCE LINK
The treatise is conventionally dated around 825. The wider 800–850 window preserves that approximation.
AUDIT RECORD ↗1100 CE–1199 CEcentury
ROUTE STAGEIberian and Latin translation worlds
algebra
12th century
Arabic mathematical vocabulary moves through translation into Medieval Latin and Romance.
1 EVIDENCE LINK
The translation stage is encoded at century precision; the reviewed source reports Robert of Chester's work around 1140.
AUDIT RECORD ↗Early modern1 ON THIS PAGE
1551 CEexact
ROUTE STAGEEngland
algebra
1551
The mathematical word enters the English lexicographic record.
1 EVIDENCE LINK
1551 is the reviewed lexicographic first-known-use year for English algebra, not the date of every English occurrence.
AUDIT RECORD ↗UNBOUNDED IS
A REAL RESULT.
Stages without source-backed numeric bounds stay in their complete Journey Atlas route, carry an explicit temporal note, and remain absent here until the evidence supports normalization. The missing point is visible work—not permission to guess.