-xión

• IPA^(key): /ˈsjon/ [ˈsjõn]
• Rhymes: -on
• Syllabification: -xión

-xión f (plural -xiones)

1. Suffix indicating a process, action or effect, like "-ction" in English

• Used only in anexión, conexión (and derived nouns), crucifixión, complexión and flexión (and derived nouns)
• Although etymologically related, through a detergent brand, Spanish words axión and acción are unrelated in meaning and context, and, in Spain, first word is pronounced using a voiceless alveolar fricative (s), while second one is pronounced using a voiceless dental fricative consonant (θ) for its second "c" (rest of Spanish speakers use "s" for both).