in English is:

monogamy

Mutations

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

Use

yr unwreiciaeth hon
fy unwreiciaeth i
dy unwreiciaeth di
ei unwreiciaeth ef/o
ei hunwreiciaeth hi
ein hunwreiciaeth ni
eich unwreiciaeth chi
eu hunwreiciaeth nhw/hwy
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