combination air-oil circuit

combination Noun

— A combination is an item or group made of different things or kinds of things. Any combination of these factors increases the risk dramatically. — Combination is the process of putting two or more things together. — math{C}_{n}^{m}/math

air Noun

— Air is a mixture of gases. It has no color or odor (smell) We breathe air to live. — You put on airs when you act arrogantly. The woman put on the airs in front of her friends.

air Verb

— If you air something, you broadcast it, either over the radio, or on television. Hurry! You'll miss the story about homeless children that is about to air on the local news!

oil Noun

— Oil is a liquid that is burned to create heat or used in machines to make them run well. Gas and oil are essential to running a car. — Oil is a liquid made of fat that is used for cooking. Cook the potatoes in oil. — An oil is a painting made of oil paint.

oil Verb

— If you oil something, you put clear oil on a machine to make it run well. She oiled the parts of the gun.

circuit Noun

— A circuit is a loop that normally starts and finishes in the same place. They ran a circuit around the park. — A circuit is a closed route where electricity flows. The electric circuit can hold 20 amperes.