The Collaborative International Dictionary of English v.0.48:

conceptualisation \conceptualisation\ n.
   the act of formulating or making a concept of something.

   Syn: conceptualization, formulation, formularizing,
        formularising.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

conceptualisation
    n 1: an elaborated concept [syn: conceptualization,
         conceptualisation, conceptuality]
    2: inventing or contriving an idea or explanation and
       formulating it mentally [syn: conceptualization,
       conceptualisation, formulation]

The Free On-line Dictionary of Computing (30 December 2018):

conceptualisation

    The process or result of listing the
   types of objects, concepts and other entities that are assumed to
   exist in some area of interest and the relationships that hold
   among them.  A conceptualisation is an abstract, simplified view
   of the world that we wish to represent.  For example, we may
   conceptualise a family as the set of names, sexes and the
   relationships of the family members.  Choosing a
   conceptualisation is the first stage of knowledge
   representation.  A conceptualisation is a high-level data model.

   Every knowledge base, knowledge-based system, or
   knowledge-level agent is committed to some
   conceptualisation, explicitly or implicitly.

   (2013-04-17)