surtout bedeutet auf Englisch

especially▼◼◼◼(particularly)
adverb
[UK: ɪ.ˈspe.ʃə.li] [US: ə.ˈspeʃ.l̩i]She likes fruit, especially apricots. = Elle aime les fruits, surtout les abricots.

mainly▼◼◼◼(chiefly; for the most part)
adverb
[UK: ˈmeɪn.li] [US: ˈmeɪn.li]They mainly live on milk. = Ils se nourrissent surtout de lait.

primarily▼◼◼◼(of a primary or central nature)
adverb
[UK: ˈpraɪ.mə.rə.li] [US: praɪ.ˈme.rə.li]

mostly▼◼◼◼(for the most part)
adverb
[UK: ˈməʊst.li] [US: ˈmoʊst.li]His sickness was mostly in his head. = Sa maladie était surtout dans sa tête.

chiefly▼◼◼◻(mainly or principally, almost entirely)
adverb
[UK: ˈtʃiː.fli] [US: ˈtʃiː.fli]

above all▼◼◼◻(of prime importance)
preposition
[UK: ə.ˈbʌv ɔːl] [US: ə.ˈbʌv ɔːl]