Verb

(defin)

To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly.

* Sir (Isaac Newton)

Ringsvery distinct and well defined .

*{{quote-magazine, year=2013, month=July-August, author= Lee S. Langston

, title= The Adaptable Gas Turbine , passage=Turbines have been around for a long time—windmills and water wheels are early examples. The name comes from the Latin turbo'', meaning ''vortex , and thus the defining property of a turbine is that a fluid or gas turns the blades of a rotor, which is attached to a shaft that can perform useful work.}}

(obsolete) To settle, decide (an argument etc.).

* 1596 , (Edmund Spenser), (The Faerie Queene) , IV.3:

These warlike Champions, all in armour shine, / Assembled were in field the chalenge to define .

To express the essential nature of something.

*{{quote-magazine, year=2013, month=May-June, author=

, volume=101, issue=3, page=178, magazine=(American Scientist) , title= Crinkly Curves , passage=Cantor defined a one-to-one correspondence between the points of the square and the points of the line segment. Every point in the square was associated with a single point in the segment; every point in the segment was matched with a unique point in the square.}}

To state the meaning of a word, phrase, sign, or symbol.

To describe, explain, or make definite and clear.

To demark sharply the outlines or limits of an area or concept.

*{{quote-magazine, year=2012, month=March-April, author=(Jan Sapp)

, volume=100, issue=2, page=164, magazine=(American Scientist) , title= Race Finished , passage=Few concepts are as emotionally charged as that of race. The word conjures up a mixture of associations—culture, ethnicity, genetics, subjugation, exclusion and persecution. But is the tragic history of efforts to define groups of people by race really a matter of the misuse of science, the abuse of a valid biological concept?}}

(mathematics) To establish the referent of a term or notation.

Verb

(elucidat)

To make clear; to clarify; to shed light upon.

* 1817 , , Northanger Abbey , ch. 13:

The business, however, though not perfectly elucidated by this speech, soon ceased to be a puzzle.

* 1960 , " Medicine: Unmasking the Brain," Time , 4 April:

[P]hysicians at the annual meeting of the American Academy of General Practice were fascinated by a 3-ft. model showing the brain's components in 20 layers of translucent plastic, and wired for colored lights to elucidate some of its workings.

* 2004 , David Bernstein, “ Philosophy Hitches a Ride With ‘The Sopranos’,” New York Times , 13 April (retrieved 19 Aug. 2009):

The new Sopranos volume has 17 essays that examine the television show and elucidate concepts from classical philosophers, including Aristotle, Machiavelli, Nietzsche, Sun Tzu and Plato.