The hiring of automobiles (motor cars) for relatively short periods(noun)
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Use "car rental" in a sentence
"At six-fifty-two, a wide-bodied van of the type often used to shuttle travelers from airports to car rental lots parked in front of the hotel."
"AFTER I got off the phone with Stettner I called a car rental agency in the neighborhood and reserved a car."
"Every car rental company had its own buses, and they were all weird-looking, with oddball color patterns and hatlike outgrowths and strangely placed fins, as though they were designed by the same people who draw spaceships in comic books."