Etymology
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Words related to -ia

-a (1)
word-forming element which in English is characteristic of fem. nouns and adjectives of Latin or Greek origin (such as idea, coma, mania, basilica, arena, formula, nebula). From Latin -a (plural -ae) and Greek -a, (plural -ai, Latinized as -ae). The Latin suffix also became Italian -a (plural -e), Spanish -a (plural -as). It is represented in Old English by -u, -e, but even then the suffix was fading and by the time of modern English was totally lost or swallowed into silent final -e-.

It also appears in Romanic words from Latin that have been borrowed into English, such as opera, plaza, armada. It figures in scientific names coined in Modern Latin (amoeba, soda, magnolia, etc.) and is common in geographical names formed according to Latin or Greek models (Asia, Africa, America, Arabia, Florida, etc.)

In English it marks sex only in personal names (Julia, Maria, Alberta) and in a few words from Italian or Spanish where a corresponding male form also is in use (donna, senora).
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-cy 
abstract noun suffix of quality or rank, from Latin -cia, -tia, from Greek -kia, -tia, from abstract ending -ia (see -ia) + stem ending -c- or -t-. The native correspondents are -ship, -hood.
-a (2)
nominative neuter plural ending of certain nouns and adjectives in Latin and Greek that have been adopted into English (phenomena, data, media, criteria, etc.). It also is common in biology in Modern Latin formations of class names (Mammalia, Reptilia, Crustacea).
acomia (n.)

"baldness," Modern Latin, from Greek akomos "hairless, bald," from a- "not, without" (see a- (3)) + komē "hair" (see comet) + abstract noun suffix -ia.

Aglaia 
name of one of the Graces, Greek, literally "splendor, beauty, brightness," from aglaos "splendid, beautiful, bright," which is of unknown origin (probably connected with agauos "noble, illustrious;" see agave), + abstract noun ending -ia.
Alexandria 
city in Egypt, founded 332 B.C.E. by Alexander the Great, for whom it is named. Also see -ia. Related: Alexandrian.
Algeria 
North African country, named for Algiers, city chosen by the French as its capital when they colonized the region in 1830 + Latinate "country" suffix -ia. The city name is Arabic al-Jazair, literally "the islands" (plural of jezira) in reference to four islands formerly off the coast but joined to the mainland since 1525. Related: Algerian (1620s); a resident of the place (especially indigenous, as opposed to French colonists) also could be an Algerine (1650s), and that word was practically synonymous with "pirate" in English and U.S. usage early 19c.
amastia (n.)
"complete failure of one or both breasts, including the nipple, to develop," 1878, medical Latin, from German amastia (1841), from Greek amastos "without breasts," from privative prefix a- "not, without" (see a- (3)) + mastos "breast" (see masto-) + abstract noun ending -ia.
amblyopia (n.)

1706, "weakening of the eyesight without any apparent defect in the eyes," medical Latin, from Greek amblyopia "dim-sightedness," noun of action from amblys "dulled, blunt" (from a suffixed form of PIE root *mel- (1) "soft") + ōps "eye" (from PIE root *okw- "to see") + abstract noun ending -ia. Related: Amblyopic.

amentia (n.)
"mental deficiency," late 14c., from Latin amentia "madness," from amentem "mad," from a for ab "away from" (see a- (2)) + mentem "mind" (from PIE root *men- (1) "to think") + abstract noun ending -ia.