前半天

morning / a.m. / first half of the day

front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly

half / semi- / incomplete / (after a number) and a half

half of the day / a long time / quite a while / midair / CL:個|个[ge4]

day / sky / heaven