recon

"He went out in the rain and came back thoroughly drenched."

"Check the oil in your car once a month."

"A small group."

"The pilot reported the findings of his reconnoiter."

"one of the fundamentals of linear algebra"

"The subway train is undergoing a tunnel underneath the city. "

"Before deciding where to have lunch, we did some reconnaissance of the different restaurants on Main Street to see which had the shortest line. "

"Scientists study plants to understand how they grow. "

"It was a surprise to find out I owed twice as much as I thought I did."

"The teacher patiently explained the math problem, and the students were able to understand the steps involved. "

"After the old band broke up, there was a recombination of some members into a new group with a different style. "

"The theoretical model for how to improve student focus in class was presented, but it hasn't yet been tested in a real classroom setting. "