The Collaborative International Dictionary of English v.0.48:

Acts \Acts\ n.
   1. 1 one of the books of the Christian New Testament
      describing the activities of Christ's apostles after his
      death.

   Syn: Acts of the Apostles
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Acts
    n 1: a New Testament book describing the development of the
         early church from Christ's Ascension to Paul's sojourn at
         Rome [syn: Acts of the Apostles, Acts]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ACTS
       Advanced Communications Technologies and Services (Europe, ACTS)