WordReference English-Spanish Dictionary © 2017:

Principal Translations
SpanishEnglish
en un principio exprexpresión: Expresiones idiomáticas, dichos, refranes y frases hechas de tres o más palabras ("Dios nos libre", "a lo hecho, pecho"). (al comienzo)at first, at the beginning exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
  (formal)initially advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
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WordReference English-Spanish Dictionary © 2017:

Compound Forms:
SpanishEnglish
si bien en un principio although in the beginning exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
  even though in the beginning exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
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'en un principio' found in these entries
English:

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