Adjective

(en adjective)

Relating to the basic, essential or fundamental part of something.

Relating to an elementary school.

(physics) Relating to a subatomic particle.

* {{quote-magazine, date=2012-03

, author=(Jeremy Bernstein) , title=A Palette of Particles , volume=100, issue=2, page=146 , magazine=(American Scientist) citation , passage=The physics of elementary particles in the 20th century was distinguished by the observation of particles whose existence had been predicted by theorists sometimes decades earlier.}}

(archaic) Sublunary; not celestial; belonging to the sublunary sphere, to which the four classical elements (earth, air, fire and water) were confined; composed of or pertaining to these four elements.

Adjective

(en adjective)

Sagacious in adapting means to ends; circumspect in action, or in determining any line of conduct; careful, discreet, sensible; -- opposed to rash; directed by prudence or wise forethought; evincing prudence;

* {{quote-book

, year=1864 , author=Jules Verne , title=A Journey to the Center of the Earth , chapter=30 citation , passage=He did not hesitate what to do. It would be prudent to continue on to Omaha, for it would be dangerous to return to the train, which the Indians might still be engaged in pillaging.}}

* Moses established a grave and prudent law . --Milton.

Practically wise, judicious, shrewd

''His prudent career moves reliably brought him to the top

Frugal; economical; not extravagant;

Only prudent expenditure may provide quality within a restrictive budget