Meanings
-ion1
-ion2
- An anthropometric reference point.
dactylion
- Especially craniometric points
gnathion
-ion3
- Together with apo- and peri-, forms names of specific apoapsides and periapsides.
periareion
Synonyms & antonyms
Origin
-ion · suffix
- Latin-tiō
- Middle French-tion
- English-ion
Reanalysed from -ation, -tion, from Middle French -tion, -cion, from Latin -tiō. By surface analysis, this suffix is added to verbs derived from Latin perfect participle stems.
More words from Middle French, Latin
Full word history & related roots →-ion · suffix
Possibly reanalysed from inion, which is of Ancient Greek origin. In many cases also analysable as the neuter form of an Ancient Greek adjective in -ιος (-ios).
Full word history & related roots →-ion · suffix
- Ancient Greekἀπόγειον“apogee”
- English-ion
From Ancient Greek ἀπόγειον (apógeion, “apogee”), containing -ιον (-ion). Compare also -ium.
More words from Ancient Greek
Full word history & related roots →Cite this entry
-ion. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/-ion
“-ion.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/-ion. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “-ion,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/-ion.
Source: -ion on Wiktionary, CC BY-SA 4.0.