in English is:

acceleration

Mutations

Soft:gyflymiad
Nasal:nghyflymiad
Aspirate:chyflymiad

Use

y cyflymiad hwn
fy nghyflymiad i
dy gyflymiad di
ei gyflymiad ef/o
ei chyflymiad hi
ein cyflymiad ni
eich cyflymiad chi
eu cyflymiad nhw/hwy
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