consent
This word carries a heavy weight of legality and formality. It is not a casual agreement like saying yes to a movie; it is a conscious, voluntary decision that grants authority or permission. In legal or medical settings, it represents a protective barrier ensuring that an individual's autonomy is respected before an action is taken. There is a strong moral and ethical dimension to the term, particularly in modern social contexts. While agreement can be implicit or vague, consent is ideally explicit and informed, shifting the focus from the act of asking to the quality of the permission granted.
Uncountable when referring to the general concept of permission (We need consent). Countable when referring to a specific instance of a formal agreement (The patient signed three separate consents).