Q: Is arrest the act of depriving people of their liberty? ¶
A: Yes, and usually in relation to an investigation or prevention of a crime, and thus detaining the arrested person in a procedure as part of the criminal justice system.
Q: Is arrest unlawful? ¶
A: Yes.
Q: Is arrest given in various dictionaries depending upon the circumstances in which word is used? ¶
A: Yes.