What is the meaning of hi5 mode in Lenovo K4 Note?

Hi dinesh. I believe you are pertaing to hi-fi. If that's what you're pertaining to:

High fidelity (often shortened to hi-fi or hifi) reproduction is a term used by home stereo listeners, audiophiles and home audio enthusiasts to refer to high-quality reproduction of sound to distinguish it from the lower quality sound produced by inexpensive audio equipment, or the inferior quality of sound reproduction that can be heard in recordings made until the late 1940s. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the intended frequency range. source

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