The definition of a pioneer is the first person to do something, like to explore a new territory or to enter a military action.
(noun)An example of a pioneer is are early Americans who settled the old west.
See pioneer in Webster's New World College Dictionary
noun
Origin: Fr pionnier < OFr peonier, foot soldier < peon: see peon
adjective
intransitive verb
transitive verb
See pioneer in American Heritage Dictionary 4
noun
Origin:
Origin: French pionnier
Origin: , from Old French peonier, foot soldier
Origin: , from peon
Origin: , from Medieval Latin pedō, pedōn-
Origin: , from Late Latin, one who has broad feet
Origin: , from Latin pēs, ped-, foot; see ped- in Indo-European roots
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