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One who demonstrates; one who proves anything with certainty, or establishes it by indubitable evidence.

Tending to demonstrate; demonstrative. Johnson.

An evil spirit; a devil or demon. Shak.

A good angel. Southey.

That part of moral philosophy which treats of happiness; the science of happiness; -- contrasted with aretaics. J. Grote.

That system of ethics which defines and enforces moral obligation by its relation to happiness or personal well-being.

One who believes in eudemonism. I am too much of a eudæmonist; I hanker too much after a state of happiness both for myself and others. De Quincey.

Of or pertaining to eudemonism.

Eudemonistic.

The quality of being indemonstrable.

Incapable of being demonstrated. -- In`de*mon"stra*ble*ness, n.

The great hall or council chamber of demons or evil spirits. Milton.

To demonstrate again, or anew. Every truth of morals must be redemonstrated in the experience of the individual man before he is capable of utilizing it as a constituent of character or a guide in action. Lowell.

modification of the aëroplane, having curved surfaces, the advantages of which were first demonstrated by Lilienthal.

The science, doctrine, or demonstration of causes; esp., the investigation of the causes of any disease; the science of the origin and development of things.

A powerful evil jinnee, demon, or monstrous giant.

Not apodeictic; undemonstrable. [R.]

Attendant spirit; genius; demon. Shak.

regard to angels. The same mythology commanded the general consent; the same angelology, demonology. Milman.

Full demonstration.