There are 2 definitions of -i in English:

-i1

Pronunciation: /i, ʌɪ, iː/

suffix

  • Forming the plural:
  • 1Of nouns adopted from Latin ending in -us: foci timpani
  • 2Of nouns adopted from Italian ending in -e or -o: dilettanti

Usage

Many nouns derived from a foreign language retain their foreign plural, at least when they first enter English and particularly if they belong to a specialist field. Over time, though, it is quite normal for a word in general use to acquire a regular English plural. This may coexist with the foreign plural (e.g. cactus, plural cacti or cactuses) or it may actually oust a foreign plural. Note that not all Latin words ending in -us have a plural that ends in -i: for example, the Latin word apparatus is unchanged in the plural.

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Definition of -i in:

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Word of the day maelstrom
Pronunciation: ˈmeɪlstrəm
noun
a powerful whirlpool in the sea

There are 2 definitions of -i in English:

-i2

suffix

  • Forming adjectives from names of countries or regions in the Near or Middle East: Azerbaijani Pakistani

Origin

from Semitic and Indo-Iranian adjectival endings.

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Definition of -i in: