- -i1suffix forming the plural:1》 of nouns adopted from Latin ending in -us: foci.2》 of nouns adopted from Italian ending in -e or -o: dilettanti.UsageMany 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, it is 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 (octopus, plural octopuses rather than octopodes).————————-i2suffix forming adjectives from place names in the Near or Middle East: Azerbaijani.Originfrom Semitic and Indo-Iranian adjective endings.
English new terms dictionary. 2014.