say it: OH-puh-nur
opener is a noun meaning "the first event in a series". It carries 3 recorded senses.
the first event in a series
“she played Chopin for her opener”
“the season's opener was a game against the Yankees”
a person who unfastens or unwraps or opens
“children are talented undoers of their shoelaces”
a hand tool used for opening sealed containers (bottles or cans)
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 opener 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.