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A state of being acquainted, or of having intimate, or more than slight or superficial, knowledge; personal knowledge gained by intercourse short of that of friendship or intimacy; as, I know the man; but have no acquaintance with him. Contract no friendship, or even acquaintance, with a guileful man. Sir W. Jones.…

The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.

ommercial zinc; -- so called because certain of its compounds are darkened by exposure to light.

nt for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol.

The science which treats of rays of light, especially of the actinic or chemical rays.

An instrument for measuring the actinic effect of rays of light.

The measurement of the chemical or actinic energy of light. Abney.

Having nice or quick sensibility; susceptible to slight impressions; acting keenly on the senses; sharp; keen; intense; as, a man of acute eyesight, hearing, or feeling; acute pain or pleasure.

the senses, or the understanding. By acuteness of feeling, we perceive small objects or slight impressions: by acuteness of intellect, we discern nice distinctions. Perhaps, also, he felt his professional acuteness interested in bringing it to a successful close. Sir W. Scott.

A soft, unctuous, or waxy substance, of a light brown color, into which the fat and muscle tissue of dead bodies sometimes are converted, by long immersion in water or by burial in moist places. It is a result of fatty degeneration.

To join one's self. [Obs.] She lightly unto him adjoined side to side. Spenser.

Wonder mingled with approbation or delight; an emotion excited by a person or thing possessed of wonderful or high excellence; as, admiration of a beautiful woman, of a landscape, of virtue.

To regard with wonder and delight; to look upon with an elevated feeling of pleasure, as something which calls out approbation, esteem, love, or reverence; to estimate or prize highly; as, to admire a person of high moral worth, to admire a landscape. Admired as heroes and as gods obeyed. Pope.

Regarded with wonder and delight; highly prized; as, an admired poem.

Giving a faint shadow, or slight resemblance; shadowing forth.

To give a faint shadow or slight representation of; to outline; to shadow forth. Both in the vastness and the richness of the visible universe the invisible God is adumbrated. L. Taylor.

Light as air; ethereal. Aërial acid, carbonic acid. [Obs.] Ure. -- Aërial perspective. See Perspective.

A sickness felt by aëronauts due to high speed of flights and rapidity in changing altitudes, combining some symptoms of mountain sickness and some of seasickness.

The science of gliding and soaring flight.

Plighted faith; marriage contract or promise.