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“predecessor” in Latin

The English word predecessor itself goes back to Latin dēcēdō, through praedēcessor.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

predecessor
(in an office)(in an office), decessor (Cic., Tac. ☞ Antecessor only in the lawyers). He is my predecessor, succedo ei: one of his predecessors, quilibet superiorum (e.g., regum).

Quick answer

What is the Latin word for predecessor?
The usual Latin words for “predecessor” are dēcessor, rēx. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.