A conjunction is similar to an adverb, except that it takes both a left and right argument. The rank conjunction was introduced informally in an earlier section. In addition, the : used to define verbs such as centigrade can now be recognized as a conjunction. In defining centigrade, the : takes a left argument of 3 and a right argument of 0. So far it could be a verb, but the fact that its result is a verb proves it is a conjunction.
The verb result of a conjunction is referred to as a derived verb.