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Words related to -ian

-an 
word-forming element meaning "pertaining to," from Latin -anus, adjective suffix, in some cases via French -ain, -en. From PIE *-no-.
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-i- 
a "connective" element in many words formed with Latin or Greek suffixes, now often felt as part of them (as in -iac, -iacal, -ial, -ian, -ify, -ity, etc.). Properly it forms no proper part of the suffix but is often the stem-vowel of the initial word in the Latin compounds (genial from genius), or a modified form of it. As such forms were very common, -i- was used merely connectively or euphonically in some Latin compounds (uniformis) and in later words made from Latin components in English or French (centennial, editorial).

The Greek equivalent is -o-, which also became an active connective in English, but they now are used indifferently with elements from either language.
Algonquian 

also Algonkian, Native American people and language family, 1885, an ethnologist's word, from Algonquin, name of one of the tribes, + -ian. Both forms of the name have been used as adjectives and nouns. They originally were spread over a wide area of northeast and north-central North America, from Nova Scotia (Micmac) to Montana (Cheyenne). From 1890 in geology.

Amazonian (adj.)
"bold, warlike," generally of women, 1590s, from Amazon + -ian. From 1847 in reference to the River Amazon.
antichristian (adj.)
1530s, "pertaining to the Antichrist," from antichrist + -ian; as "hostile or opposed to to Christianity or Christians" (also anti-Christian), 1580s, from anti- + Christian (adj.). Related: Antichristianity.
Apollonian (adj.)
1660s, "of, pertaining to, or resembling the Greek god Apollo," from Apollo (Greek Apollon) + -ian. The Greek adjective was Apollonios. Other adjectival forms in English include Apollinarian, Apollonic, Apolline (c. 1600). Also sometimes in reference to Apollonius of Perga, the great geometer.
Aquarian (adj.)
"pertaining to the zodiacal sign of Aquarius," 1940 in reference to the astrological Age of Aquarius (see Aquarius + -ian). Earlier, "one who uses water instead of wine at the Eucharist" (1580s).
Arabian 
c. 1300, adjective and noun; see Arab + -ian. As a prized type of horse, it is attested from 1660s. The Arabian bird was the phoenix.
Arthurian (adj.)
"pertaining to the series of tales of British King Arthur and his knights," 1793, from Arthur + -ian.
Athenian (n.)
1520s, "native or inhabitant of Athens;" see Athens + -ian. From 1580s as an adjective, "pertaining to Athens." Old English had Atheniense (plural noun), from Latin Atheniensis.