WordReference English-Spanish Dictionary © 2014:

Principal Translations
gratis advadverbio: Describe al verbo, al adjetivo o a otro adverbio ("corre rápidamente", "sucede ahora", "muy extraño"). (de balde)free advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
  gratis advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
 La entrada a este museo es gratis.
gratis adjadjetivo: Describe el sustantivo. Puede ser posesivo, numeral, demostrativo ("casa grande", "mujer alta"). (sin costo)free adjadjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house."
 Voy a un concierto gratis de música clásica.
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WordReference English-Spanish Dictionary © 2014:

Compound Forms:
envío gratis loc nom (remisión sin coste)free delivery nnoun: Refers to person, place, thing, quality, etc.
soñar es gratis there's no charge for dreaming, dreaming is free of charge
trabajar gratis work for free
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'gratis' found in these entries
In the Spanish description:
English:

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