IPA: /dʒəˈmɪneɪʃən/
KK: /jəˈmɪneɪʃən/
A situation in which a consonant sound is held or pronounced for a longer time than usual.
In some languages, gemination can change the meaning of a word, such as in Italian where 'papa' means 'pope' and 'pappa' means 'food'.
Gemination is formed from 'geminare' (meaning to double) and the suffix '-tion' (indicating the action or process of). The word describes the action or process of doubling a consonant sound in phonetics.
Think of 'doubling' ('geminare') something — that's what gemination means, the process of doubling a sound.