round-trip operation

round Preposition

— If mathx/math is round mathy/math, mathy/math is in the middle and mathx/math is on all sides. Everyone stood round the fire to keep warm. — If you turn or look round, you are now facing the opposite direction. She turned round to see what had made the noise. — You round up numbers in math You round 28 up to 30.

round Adjective

— Something is round if it's like a circle or like part of a circle. It is curved, not straight.

trip Noun

— A trip is a journey to a place Let us go on a trip to John Doe Mountain. I have not been there in a while. — A trip is when a person stumbles over something. He broke his wrist after that nasty trip.

trip Verb

— When a person trips, he stumbles over something. Be careful of all the books on the floor. You do not want to trip.

operation Noun

— An operation is a medical process, often opening the human body. The doctors performed the operation in three hours. — An operation is an action of a group of people working for a goal (often military). The Army operation was a success. — An operation is part or all of a business. small(often plural)/small The company's East Coast operation was bigger than its West Coast operation. — An operation is a symbol that is used to perform a specific operation (addition, subtraction, multiplication or division) in maths. The plus symbol is used to perform a specific operation in maths which is addition.