el·e·men·ta·ry 
/ˌɛləˈmɛntri/ adjective
/ˌɛləˈmɛntri/ adjective 1 [more elementary; most elementary] : basic and simple
▪ an elementary principle ▪ He is lacking even the most elementary notions of fairness. ▪ The researchers made an elementary error. : involving the simplest parts of a subject ▪ He has an elementary understanding of calculus. ▪ elementary arithmetic — compare elemental 2 always used before a noun, chiefly US : of or relating to elementary school
▪ elementary [=grade-school] students ▪ elementary education
▪ an elementary principle ▪ He is lacking even the most elementary notions of fairness. ▪ The researchers made an elementary error. : involving the simplest parts of a subject ▪ He has an elementary understanding of calculus. ▪ elementary arithmetic — compare elemental
▪ elementary [=grade-school] students ▪ elementary education
