Hi-fi (noun)

1. A high-fidelity sound reproduction system, typically including a turntable, amplifier, and speakers.
2. A system of audio reproduction that is designed to reproduce sound as accurately as possible.

Origin:

An abbreviation of the phrase "high-fidelity", which refers to equipment that reproduces sound with minimal distortion.

Examples:

1. He spent a lot of money on his hi-fi system and was very proud of it.
2. The sound quality of a hi-fi system is much better than a standard radio or television.
3. The music from the hi-fi system filled the room with a rich, clear sound.
4. The hi-fi system was a popular choice for music enthusiasts in the 1950s and 1960s.
5. The hi-fi system was able to reproduce sound with minimal distortion and noise.