/ Dictionary / Index D declinometer: Meaning and Definition of Find definitions for: dec•li•nom•e•ter Pronunciation: (dek"lu-nom'i-tur), [key] — n. an instrument for measuring magnetic declination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: declinometer (Thesaurus) Decline and Fall of the Roman Empire, The* declive Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language