English

decode

From de- + code.

A compound of de- + code

Latin dē ‘of; from’

English de-

Latin caudex ‘the stock or stem of a tree’

Latin cōdex ‘tree trunk’

Old French code ‘system of law’

Middle English code ‘system of law’

English code

Today it means

verb To convert from an encrypted form to plain text.

Language periods are conventional ranges, not dates for this word.