apropos

 
Pronunciation: /ˌaprəˈpəʊ, ˈaprəpəʊ/

preposition

  • with reference to; concerning: she remarked apropos of the initiative, ‘It’s not going to stop the abuse’

adjective

[predic.]
  • very appropriate to a particular situation: the song feels apropos to a midnight jaunt

Phrases

apropos of nothing

having no relevance to any previous discussion or situation: Isabel kept smiling apropos of nothing

Origin:

mid 17th century: from French à propos '(with regard) to (this) purpose'