The adj elementary has 2 senses (first 1 from tagged texts)
1. (2) elementary, simple, uncomplicated, unproblematic -- (easy and not involved or complicated; "an elementary problem in statistics"; "elementary, my dear Watson"; "a simple game"; "found an uncomplicated solution to the problem")
2. elementary, elemental, primary -- (of or being the essential or basic part; "an elementary need for love and nurturing")