- most conducive to a favourable outcome; best有最佳效果的; 最佳的：
the optimum childbearing age.
最佳生育年龄。
(pl. optima /-mə/ 或optimums)
- the most favourable conditions or level for growth, reproduction, or success（生长、繁殖或成功的）最佳条件, 最适度。
词源
late 19th cent.: from Latin, neuter (used as a noun) of optimus 'best'.