What is the meaning of -î?

Added to nouns and adjectives to form adjectives meaning “having the quality of”: -y, -ish, -like

Added to placenames (or roots thereof) or ethnonyms to form adjectives meaning “of or pertaining to”: -ian, -ese, -ic, -ish

Used to derive abstract nouns from adjectives: -ness, -ity, -hood

Used for conjugation of the second person singular (tu):

Added to placenames to make a gendered noun of origin or nationality:

his or her:

Used for present tense conjugation of the third person singular:

Forms agent nouns from verbs

A suffix forming infinitives of many verbs.

Indicates a person who does (as a profession) the action described by the root word. Roughly equivalent to English -er.

A verb ending for infinitives.

Source: wiktionary.org