en premier lieu bedeutet auf Englisch

first▼◼◼◼(before anything else)
adverb
[UK: ˈfɜːst] [US: ˈfɝːst]

firstly▼◼◼◻(in the first place)
adverb
[UK: ˈfɜːst.li] [US: ˈfɝːst.li]

first of all▼◼◼◻(before anything else)
adverb
[UK: ˈfɜːst əv ɔːl] [US: ˈfɝːst əv ɔːl]

in the first place▼◼◼◻(to begin with)
preposition
[UK: ɪn ðə ˈfɜːst ˈpleɪs] [US: ɪn ðə ˈfɝːst ˈpleɪs]