IPA: /ˈpiːkɪdnəs/
KK: /ˈpikd.nəs/
The state or quality of having a peak or pointed shape.
The peakedness of the mountain made it a popular spot for climbers.
Peakedness is formed from "peak" (from Old English "pīc", meaning a pointed top or summit) and the suffix "-edness" (meaning the state or quality of). The word refers to the state of being peaked or having a pointed top.
Think of a 'peak' as a pointed top, and '-edness' indicates a state or quality. So, peakedness describes the quality of having a pointed top.