Tadaima

Tadaima is a Japanese phrase used upon returning home or to a familiar place, such as one's office. It literally translates to "I am now here" or "I'm back." It's a polite announcement of one's return and serves as a greeting to those already present in the location. The appropriate response to "Tadaima" is "Okaeri" or "Okaerinasai." The latter is more formal.