The word "front" is used when someone or something comes before another thing or person. The opposite of "front" is "back."
In this first set of examples, the word "front" is an adjective:
Sarah has a flower garden in her front yard.
Buttons are located on the front side of a shirt.
A driver sits in the front seat when driving a car.
There should be someone sitting at the front desk when a guest enters a hotel.
The word "front" may also be used as a noun:
A cold front came into our area and brought with it a foot of snow. (front = a mass of air)
A new front opened up in the decades-old war. (front = an area of active conflict)
In these sentences, "front" is a part of a prepositional phrase, in front of:
Don’t stand in front of a car when it’s moving.
There are several people standing in front of the store, waiting for it to open.
The teacher stands in front of the class when teaching.
A helping verb goes in front of a subject when making a question.
It’s possible to use "front" as a verb, but this usage may sound unusual or antiquated (old):
I need someone to front me $20,000 for a business idea I’m working on. (front = to loan money in advance of work completed)
Throreau went to live in the woods because he wanted "to front only the essential facts of life." (front = confront or face)
Daniel is fronting like he’s got all these followers on his Twitter feed. (front = pretend or brag)
There are a few other phrases and words that use "front."
A front-end loader is used for moving heavy objects uch as rocks and large amounts of soil around construction sites.
A frontier is a new area of exploration. There are new frontiers in space, in the ocean, and in modern technology and medicine.
We used to refer to unsettled areas of the United States as frontiers, but most of North America has been explored and is now populated by people. The few remaining frontier areas are in Alaska and Canada.