4. To connect with something as a natural or logical consequence or effect; to include necessarily; to imply. He knows his end with mine involved. (Milton) The contrary necessarily involves a contradiction. (Tillotson)
5. To take in; to gather in; to mingle confusedly; to blend or merge. The gathering number, as it moves along, involves a vast involuntary throng. (Pope) Earth with hell to mingle and involve. (Milton)
Imply is opposed to express, or set forth; thus, an implied engagement is one fairly to be understood from the words used or the circumstances of the case, though not set forth in form 702 . Involve goes beyond the mere interpretation of things into their necessary relations; and hence, if one thing involves another, it so contains it that the two must go together by an indissoluble connection. War, for example, involves wide spread misery and death; the premises of a syllogism involve the conclusion.
Synonym: to imply, include, implicate, complicate, entangle, embarrass, overwhelm.