-sion ending

Rule Core

The suffix -sion is a productive English noun ending, typically forming abstract nouns that express an action, process, or result. In phonics, -sion functions as a single sound unit rather than separate letters. It is most commonly pronounced /ʒən/ or /ʃən/, depending on the phonological environment and word origin.

Articulation Guide

For /ʒən/, place the tongue close to the alveolar ridge with voicing and smooth airflow, as in diffusion. For /ʃən/, raise the tongue slightly toward the hard palate, keep the sound voiceless, and let the air create friction. The final /ən/ is always reduced and unstressed.

Word Analysis

• diffusion /dɪˈfjuːʒən/: derived from diffuse; voiced sound favors /ʒən/.
• inversion /ɪnˈvɜːʒən/: Latin root vers leads to the same pattern.
• persuasion /pəˈsweɪʒən/: spelling suggests /s/, but phonics confirms /ʒən/.

Pitfalls

Avoid pronouncing -sion as /sɪon/. Also, do not confuse it with -tion or -ssion, which follow different phonetic and spelling rules.