-sion ending

Rule Core

The -sion ending is typically found in abstract nouns derived from Latin-based verbs or adjectives. Its key phonetic rule is that -sion often realizes as /ʒən/ when preceded by voiced sounds such as s, z, d, or r. Unlike its spelling, the pronunciation is morphophonemic and depends on stress and historical sound change rather than surface letters alone.

Articulation Guide

To produce /ʒ/, raise the tongue toward the alveolar ridge without full contact. Let voiced airflow pass through a narrow channel, then relax quickly into a reduced /ən/. The jaw stays loose, and the second vowel is unstressed and short.

Word Analysis

delusion /dɪˈluːʒən/: vowel + sion yields a clear /ʒ/ sound. immersion /ɪˈmɜːrʒən/: r influences voicing but keeps /ʒ/. precision /prɪˈsɪʒən/: stress placement helps signal /ʒən/ rather than /ʃən/.

Pitfalls

Avoid reading -sion literally as /sion/. Do not confuse it with -tion or -ssion, which usually produce /ʃən/.