aerodynamic

"The divers encountered a huge school of mackerel."

"The teacher explained the new math concept quickly. "

"The dry-stone wall used a large, flat through to support the top stones. "

"I have a house and a car."

"to reduce weight, speed, heat, expenses, price, personnel etc."

"The design for the new school library specifies the exact size of the reading room and the number of computers needed. "

"The waiter carried the trays of food smoothly, avoiding any spills. "

"Of course in my opinion Social Studies is more of a science than an art."

"My dad took the airplane to visit his sister in another city. "

"The car's aerodynamics helped it achieve excellent fuel efficiency. "

"Please relate the circumstances of your journey here today."

"to allow a servant his liberty;  to allow a free passage;  to allow one day for rest"