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- immer (Ger): always
- imperioso: imperiously
- impetuoso: impetuously
- improvvisando: with improvisation
- improvvisato: improvised, or as if improvised
- in altissimo: in the highest; i.e., play or sing an octave higher
- incalzando: getting faster and louder
- innig: intimately, heartfelt
- insistendo: insistently, deliberate
- in modo di: in the art of, in the style of
- intimo: intimately
- intro: opening section
- irato: angrily
- -issimo: a suffix meaning 'extremely', e.g. fortissimo or prestissimo
- -issimamente: a suffix meaning 'as...as can be', e.g. leggerissimamente, meaning 'as light as can be'
Read more about this topic: Glossary Of Musical Terminology