WordReference English-Spanish Dictionary © 2015:

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, regarding 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 preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours."
 A propósito de viajes, si queréis viajar seguros es mejor volar con una compañía que no sea de bajo coste.
 Concerning (or: regarding) travel, if you want to travel safely it is better to fly with a company that isn't so low cost.
  Is something important missing? Report an error or suggest an improvement.

'a proposito' found in these entries
In the Spanish description:
English:

Download free Android and iPhone apps

Android AppiPhone App
Infórmanos de los anuncios inapropiados.