Final answer:
The term for a combination of one color and the colors adjoining its complementary color on a color wheel is called analogous colors, which create a harmonious and calm visual effect.
Step-by-step explanation:
A combination of one color and the pair of colors adjoining its complementary color on a color wheel is known as analogous colors. These colors are located next to one another on the color wheel and tend to blend together smoothly. Analogous colors can be easily observed in various artworks, such as Mary Cassatt's The Boating Party, creating a calm atmosphere due to their low visual vibration compared to the bold contrast of complementary colors, which are directly opposite each other on the color wheel.