vodorovný znamená v angličtina

horizontal▼(parallel to the plane of the horizon)
adjective
[UK: ˌhɒ.rɪ.ˈzɒn.tl̩] [US: ˌhɔː.rə.ˈzɑːn.tl̩]

level▼(at the same height as some reference)
adjective
[UK: ˈlev.l̩] [US: ˈlev.l̩]

level▼(same height at all places)
adjective
[UK: ˈlev.l̩] [US: ˈlev.l̩]