Zenith Mining vs Zenith. Peak vs. Zenith. Peak noun. (nautical) The extremity of an anchor fluke; the bill. Zenith noun. the time at which something is most powerful or successful. 'in 1977, punk was at its zenith'; Peak noun. (mathematics) A local maximum of a function, e.g. for sine waves, each point at which the value of y is at its maximum.