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Definition opener in British English

opener noun

[countable] noun
/ˈəʊp(ə)nə(r)/
1

a tool or machine that is used for opening something

Example

a letter opener

Synonyms and related words
2

the first game in a sports season or in a competition consisting of several games

Example

the season opener

Synonyms and related words
2.1

the first goal scored in a match

Synonyms and related words
2.2

the first act in a performance that has several acts

Synonyms and related words
Definition opener in British English