Acquaintance

What does Acquaintance mean in American Law?

The definition of Acquaintance in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

When used to describe a person, it ordinarily refers to someone in a relationship with oneself someplace between having met once or twice and being friends. When, however, one says that he is acquainted with the contents of a document, the implication ordinarily is of rather thorough familiarity, though perhaps less than would be procured through deep study.