What is the meaning of Sophism?

The school of the sophists in antiquity; their beliefs and method of teaching philosophy and rhetoric.

A flawed argument, superficially correct in its reasoning, usually designed to deceive.

An intentional fallacy.

Sophistic, fallacious reasoning or argumentation.

(Can we verify this sense?) Wisdom and knowledge.

Archaic spelling of Sufism.

Source: wiktionary.org