in English is:

necessitarianism

Mutations

Soft:reidiolaeth
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y rheidiolaeth hon
fy rheidiolaeth i
dy reidiolaeth di
ei reidiolaeth ef/o
ei rheidiolaeth hi
ein rheidiolaeth ni
eich rheidiolaeth chi
eu rheidiolaeth nhw/hwy
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