say it: pahy-uh-NIR
pioneer is a verb and noun meaning "open up an area or prepare a way". It carries 5 recorded senses.
someone who helps to open up a new line of research or technology or art
one of the first colonists or settlers in a new territory
“they went west as pioneers with only the possessions they could carry with them”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for pioneer come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.