-tion meaning
EN
[ʃən] [tʃən] FR -tion 
- SuffixSUF-tion
- (non-productive) Used to form nouns meaning "the action of (a verb)" or "the result of (a verb)". Words ending in this suffix are almost always derived from a similar Latin word; a few (eg gumption) are not derived from Latin and are unrelated to any verb.
- termination (terminate)
- deletion (delete)
- ignition (ignite)
- motion (move)
- resolution (resolve)
- derivation (derive)
- action (act)
- justification (justify)
- junction (join)
- connection (connect); also, especially formerly, connexion
- gumption ( no related verb )
- communication (communicate)
- (non-productive) Used to form nouns meaning "the action of (a verb)" or "the result of (a verb)". Words ending in this suffix are almost always derived from a similar Latin word; a few (eg gumption) are not derived from Latin and are unrelated to any verb.
Definition of -tion in English Dictionary
- Part-of-Speech Hierarchy
- Morphemes
- Suffixes
- Unproductive suffixes
- Unproductive suffixes
- Suffixes
- Morphemes
- fr -tion
Source: Wiktionary
Grammatically, this word "-tion" is a morpheme, more specifically, a suffixe.