martyr

The word 'martyr' entered English via Old English 'martir,' from Late Latin 'martyr,' which itself was borrowed from the Greek 'martys' (μάρτυς), meaning "witness." In early Christian Greek, the term evolved from its secular legal sense of "one who bears testimony" to specifically denote a person who bears witness to their faith by suffering death. This semantic shift from "witness" to "one who suffers or dies for a belief" was solidified in ecclesiastical Latin and subsequently inherited by English. The term has since broadened to include anyone who endures great suffering or makes a significant sacrifice for a cause, secular or religious, while retaining its core connotation of voluntary endurance for a deeply held conviction.

The word is a simplex loanword from Greek, borrowed into English as an indivisible unit. Its core meaning is derived from the ancient Greek word 'martys' (genitive 'martyros'), meaning "witness."