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1. in the front of one's house. Our mailbox is out front. We have a spruce tree out front and a maple tree in the back.
2. leading, as in a race. My horse was out front by two lengths until the final turn. The other candidate is out front in the polls.
In front of a building or house, as in We really need to put another light out front, or I'll meet you at the museum, out front. The antonym, referring to the back of a building, is out back, as in John's out back fixing his bike. The noun front has been used for the side of a building where the main entrance is located since the mid-1300s; back for the rear of a building dates from the late 1300s.