in English is:

cooperation

,

collaboration

Mutations

Soft:gydweithrediad
Nasal:nghydweithrediad
Aspirate:chydweithrediad

Use

y cydweithrediad hwn
fy nghydweithrediad i
dy gydweithrediad di
ei gydweithrediad ef/o
ei chydweithrediad hi
ein cydweithrediad ni
eich cydweithrediad chi
eu cydweithrediad nhw/hwy
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