Definist Fallacy

Logical fallacy

Defining a term so that the conclusion is built into the definition, winning the argument by stipulation rather than evidence.

An everyday example

“Defining 'crime' so that white-collar offences don't count, then reporting that crime is concentrated among the poor.”

The same move in this debate

“Defining 'humane' so that any slaughter meeting the standard counts as humane by definition.”

Where this appears

There's nothing wrong with it if the animal is treated wellEthics & Morality

Builds the conclusion into the word. Once slaughter conducted to standard is defined as humane, there is nothing left to evaluate: the ethical question has been settled by stipulation.