yet another formative: -tion

lenition lɪˈnɪʃən
fortitoin fɔr'tɪʃən

Observations:
1. ɛ > ɪ (unstressed env)
2. ɔ > ɔ (unstressed env)

lenition: intervocalic and word-initial prevocalic positions are preferred environments for aspiration (lenition, in general) as against preconsonantal position which would constitute protected env.