Involved, a. (Zoöl.)
Same as Involute.
Shades of meaning
Fernald has no entry of its own for involved; he lists it under complex, obscure.
Where he writes about it:
In a complex object the arrangement and relation of parts may be perfectly clear; in a complicated mechanism the parts are so numerous, or so combined, that the mind can not readily grasp their mutual relations; in an intricate arrangement the parts are so intertwined that it is difficult to follow their windings; things are involved which are rolled together so as not to be easily separated, either in thought or in fact; things which are tangled or entangled mutually hold and draw upon each other. — from complex
The conception of a material object is usually complex, involving form, color, size, and other elements; a clock is a complicated mechanism; the Gordian knot was intricate; the twining serpents of the Laocoon are involved. — from complex
We speak of an abstruse statement, a complex conception, a confused heap, a heterogeneous mass, a tangled skein, an intricate problem; of composite architecture, an involved sentence; of the complicated or intricate accounts of a great business, the entangled accounts of an incompetent or dishonest bookkeeper. — from complex
To involve (L. in, in, and volvo, roll) is to roll or wind up with or in so as to combine inextricably or inseparably, or nearly so; as, the nation is involved in war; the bookkeeper's accounts, or the writer's sentences are involved. — from involve
As applied to persons, implicate is always used in an unfavorable sense, and involve ordinarily so; but implicate applies only to that which is wrong, while involve is more commonly used of that which is unfortunate; one is implicated in a crime, involved in embarrassments, misfortunes, or perplexities. — from involve
As regards logical connection that which is included is usually expressly stated; that which is implied is not stated, but is naturally to be inferred; that which is involved is necessarily to be inferred; as, a slate roof is included in the contract; that the roof shall be water-tight is implied; the contrary supposition involves an absurdity. — from involve