1. vertex, apex

noun (common) (futsuumeishi) geometry

2. top (e.g. of a mountain), summit, peak

noun (common) (futsuumeishi)

3. top (of a profession, field, etc.), summit

noun (common) (futsuumeishi)

4. peak (of popularity, a boom, etc.), height (e.g. of prosperity), apex, zenith, climax

noun (common) (futsuumeishi)