Reentry means coming back into a place or situation you've left. When astronauts return from space, their spacecraft must perform reentry into Earth's atmosphere, a dramatic moment when friction with air molecules creates intense heat that makes the spacecraft glow like a meteor. Engineers design special heat shields to protect astronauts during this dangerous phase of spaceflight.

The word also applies to everyday situations. A student returning to school after a long illness faces reentry into classroom routines and friendships. Someone reentering the workforce after years away must adjust to new technologies and expectations. Parents sometimes use reentry humorously to describe coming home after vacation, when unpacking and returning to normal life feels like landing back on Earth.

Reentry involves transition and adjustment, crossing from one state into another. The spacecraft slams into the atmosphere at thousands of miles per hour, not drifting gently. Similarly, when you reenter a situation after time away, you may need to readjust and find your place again.