Nearest means closest in distance, time, or relationship. When you're looking for the nearest bathroom, you want the one that's physically closest to where you are right now. When you check the nearest available appointment with the dentist, you're looking for the soonest one on the calendar.

If three libraries are near your house, the nearest one is whichever requires the shortest trip. In math class, when you round to the nearest ten, you're finding which multiple of ten (like 40 or 50) is closest to your number.

Nearest can also describe relationships: your nearest and dearest are the people closest to your heart, the ones you care about most deeply. Emergency contact forms often ask for your nearest relative, meaning the family member you’re most closely related to.

The phrase nearest thing to describes the best available option when you can't have exactly what you want. If your town doesn't have a beach, the community pool might be the nearest thing to swimming in the ocean.