WordReference English-Spanish Dictionary © 2014:

Principal Translations
a propósito loc advlocución adverbial: Unidad léxica estable formada de dos o más palabras que funciona como adverbio ("en vilo", "de seguido", "a quemarropa"). (deliberadamente)on purpose advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
 Ana ha roto la muñeca a propósito.
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WordReference English-Spanish Dictionary © 2014:

Principal Translations
de propósito,
a propósito
loc advlocución adverbial: Unidad léxica estable formada de dos o más palabras que funciona como adverbio ("en vilo", "de seguido", "a quemarropa").
(adrede)on purpose 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 © 2014:

Compound Forms:
a propósito | de propósito
a propósito de loc advlocución adverbial: Unidad léxica estable formada de dos o más palabras que funciona como adverbio ("en vilo", "de seguido", "a quemarropa"). (acerca de)concerning preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours."
  in relation to
 A propósito de viajes, si queréis viajar seguros es mejor volar con una compañía que no sea de bajo coste.
 Concerning travel, if you want to travel safely it is better to fly with a company that isn't so low cost.
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'a proposito' found in these entries
In the Spanish description:
English:

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