1. Having only one principle or constituent part; consisting of a single element; simple; uncompounded; as,
an elementary substance.
2. Pertaining to, or treating of, the elements, rudiments, or first principles of anything; initial; rudimental; introductory; as,
an elementary treatise.
3. Pertaining to one of the four elements, air, water, earth, fire. "Some luminous and fiery impressions
in the elementary region." J. Spencer.