in English is:

annexation

Mutations

Soft:gyfeddiannaeth
Nasal:nghyfeddiannaeth
Aspirate:chyfeddiannaeth

Use

y gyfeddiannaeth hon
fy nghyfeddiannaeth i
dy gyfeddiannaeth di
ei gyfeddiannaeth ef/o
ei chyfeddiannaeth hi
ein cyfeddiannaeth ni
eich cyfeddiannaeth chi
eu cyfeddiannaeth nhw/hwy
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