This paper argues that professional discourse relating to subject knowledge for primary teaching is less than coherent in the context of initial teacher training (ITT). This study explored the ways in which the term subject knowledge was conceptualised and interpreted by beginning primary teachers. The research was conducted across two ITT partnerships with final-year undergraduate trainees. Data were collected via questionnaires, semi-structured interviews and participatory visual methods. The findings indicated that conceptualisations of subject knowledge were highly individualised and dependent on personal factors, rather than reflecting a shared understanding of a critically distinct concept.