Webster
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Webster’s Revised Unabridged Dictionary · 1913

Intensity

In·ten′si·ty, n. [LL. intensitas: cf. F. intensité. See Intense.]

1. The state or quality of being intense; intenseness; extreme degree; as, intensity of heat, cold, mental application, passion, etc.

If you would deepen the intensity of light, you must be content to bring into deeper blackness and more distinct and definite outline the shade that accompanies it. F. W. Robertson.

2. (Physics) The amount or degree of energy with which a force operates or a cause acts; effectiveness, as estimated by results produced.

3. (Mech.) The magnitude of a distributed force, as pressure, stress, weight, etc., per unit of surface, or of volume, as the case may be; as, the measure of the intensity of a total stress of forty pounds which is distributed uniformly over a surface of four square inches area is ten pounds per square inch.

4. (Photog.) The degree or depth of shade in a picture.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.