suasion
Concise Oxford English Dictionary © 2008 Oxford University Press:
suasion /ˈsweɪʒ(ə)n/
▶noun formal persuasion as opposed to force or compulsion.
– derivatives
suasive adjective.
suasive adjective.
– origin ME: from OFr., or from L. suasio(n-), from suadere ‘to urge’.
'suasion' also found in these Oxford entries:

