This nonexperimental, exploratory, mixed-design study used questionnaires with 167 preservice secondary teachers to identify prior educational experiences associated with student-teachers' inquiry understanding. Understanding was determined through content analysis then open coding of definitions of inquiry and descriptions of best-experienced inquiry instruction, in terms of 23 potential learner-inquiry outcomes. Only two of seven educational-context variables related to understanding: prior experience doing a thesis or research-especially to definition quality and having taken a researchmethods course-especially to description quality. How definitions and descriptions of inquiry are different and similar was analyzed qualitatively and quantitatively. Implications for methodology, theory, and practice were presented, for example, research opportunities and research-methods training during teacher education. Diana Tabatabai received her MA in educational planning from the University of Toronto, and PhD in educational psychology from McGill University. She has worked as a research associate with the Toronto Board of Education, in private industry on planning and project development, as well as in medical education, psychiatry, and educational psychology at McGill University in Montreal. Bruce M. Shore holds a BSc specialized in mathematics and chemistry, a teaching diploma, and an MA in education from McGill University, and a PhD in educational psychology from The University of Calgary. He is emeritus professor of educational psychology at McGill University in Montreal, Fellow of the American Educational Research Association, and a licensed psychologist. His research is on intellectual and social qualities of giftedness and on inquiry-based teaching.