-tion suffix

Rule Core

The suffix -tion forms nouns indicating action, process, or result. In Modern English it is pronounced almost invariantly as /ʃən/, with primary stress on the preceding syllable.

Articulation Guide

Produce /ʃ/ with the tongue slightly retracted toward the post‑alveolar region, lips gently rounded, and continuous airflow. Glide into a reduced /ən/ with relaxed jaw and minimal vowel length.

Word Analysis

• action /ˈækʃən/ illustrates the stable /ʃən/ output.
• initially, neutrality, oddity do not contain -tion; they use -ial / -ity, which follow different stress and vowel patterns. This contrast prevents overgeneralization.

Pitfalls

Do not confuse -tion with -sion or -cian. They may sound similar, but spelling depends on morphology and etymology.