What term defines the dissemination of any written or printed material tending to unjustly injure a person's reputation?

The correct term for the dissemination of any written or printed material that unjustly injures a person's reputation is libel. Libel specifically refers to defamation that occurs in a permanent format, such as written statements, printed materials, or digital content. This contrasts with slander, which refers to defamation that occurs through spoken statements.

Defamation is the overarching legal term that encompasses both libel and slander, indicating any communication that can harm an individual's reputation. However, since the question specifies written or printed material, libel is the precise term that should be used. The option of assault refers to a different legal concept involving the threat or attempt to inflict bodily harm and is not related to reputation damage. Recognizing the distinction between these terms is critical in understanding the various forms of defamation and their legal implications.