Simple English definitions for legal terms
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A subscriptor is someone who wrote or signed a paper accusing someone of a crime or witnessed a will. In ancient Rome, this was a common practice. The plural form of subscriptor is subscriptores.
A subscriptor is a person who has made or signed a written accusation of crime against a particular person or who has witnessed a will.
In the first example, John signed a written accusation of crime against the accused murderer, making him a subscriptor. In the second example, Mary witnessed her friend's will, making her a subscriptor.