1 : arranged in pairs : duplicate. 2 : being a sequence of identical speech sounds (as in meanness or Italian notte \ˈnȯt-te\ "night") geminate.

What do you mean by gemination?

noun. the act or state of being doubled or paired. the doubling of a consonant. the immediate repetition of a word, phrase, or clause for rhetorical effect.

What is a geminate verb?

verb (used with or without object), gem·i·nat·ed, gem·i·nat·ing. to make or become doubled or paired.