say-so

nouns

one chap's arbitrary assertion
say-so
is a type of (narrower)
the act of affirming or asserting or stating something
affirmation, assertion, statement
an authoritative declaration
dictum, pronouncement, say-so
the power or right to give orders or make decisions
"he has the authority to issue warrants"; "deputies are given authorization to make arrests"; "a place of potency in the state"
authorisation, authority, authorization, dominance, potency, say-so