The word "voluntariness" is correct and can be used in written English.
You can use it to describe when something is done without coercion, out of one's own free will. For example: "The voluntariness of the donation speaks to the generous nature of the donor."
According to Locke's conception of voluntariness, the motion of your arm is not voluntary, because it is not caused by any volition of yours (indeed, we can even imagine that you do not even have a volition that your arm rise).
400,000: The people displaced by conflict between the government and Sunni rebels in Iraq's Anbar province 2,200 African migrants have accepted "voluntary departure" from Israel, though according to Irin, "the voluntariness of the procedure has been called into question by migrant rights organisations".
He changed his mind partly because most American police forces, which originally opposed the Miranda warning, now embrace it as a useful procedure which reduces courtroom disputes about the voluntariness of confessions.
"There has to be a deep concern about the voluntariness of consent to that long a period of detention," she said.
The proposal does not alter the requirement of evidence of voluntariness.
But even then, it rested on questionable assumptions about the "voluntariness" with which we provide our personal information to third parties — say, the financial data we give to banks or the phone numbers we dial.
If one of these components is missing – if there is inadequate or false information, or a lack of competence, or a lack of voluntariness – then there cannot be informed consent," he said.
Yet we know that a host of everyday decisions taken by patients raise questions about their true voluntariness.
Rather, she said, the test should be the voluntariness of the second statements.
If the trial judge determines that the confession was voluntarily made it shall be admitted in evidence and the trial judge shall permit the jury to hear relevant evidence on the issue of voluntariness and shall instruct the jury to give such weight to the confession as the jury feels it deserves under all the circumstances.
There is a world of difference, which the court recognized under the traditional voluntariness test but ignored in Miranda, between compelling a suspect to incriminate himself and preventing him from foolishly doing so of his own accord.
