espite discussions of "mathematics for all," opportunities that support the development of mathematical reasoning and understanding of mathematics as a human endeavor often do not exist for mathematics learners identified in schools as having dis/abilities. 1 Indeed, mathematics for all is consistently used to motivate the allocation of resources and attention to mathematics education in legislation, policy documents, and organizations' vision and position statements. Mathematics education researchers have served as advocates for marginalized students pointing out limitations in the mathematics for all rhetoric (Martin, 2003). Yet, students with dis/abilities are often left out of discussions regarding mathematics for all and equity research that has worked to contextualize and operationalize "achieving equity" and the process of "eliminating inequity" (Tate, as cited in Martin, 2003, p. 14).Mathematics education researchers and organizations representing them use the term "equity" to refer to access and opportunities for all students. For example, the National Council of Teachers of Mathematics' (NCTM) recent Principles to Actions: Ensuring Mathematical Success for All called for systemic improvement in mathematics education for all (NCTM, 2014). "Access and equity" is identified as one of six guiding principles for school mathematics (p. 5). Yet, the NCTM's (2014) position statement on access and equity leaves dis/ability out of the subgroups to which these goals apply. Access and equity are identified as applying to racial, ethnic, linguistic, gender, and socioeconomic groups. Furthermore, access and equity in standards-based mathematics education remains elusive for those stu-1 We use the term dis/ability to forefront power imbalances inherent in constructing and identifying dis/ability and the consequences of such imbalances in and out of school. The concept of dis/ability as socially constructed offers an entryway to reconstructing what mathematics education researchers mean when they use the term "disability" and to addressing inequities for individuals labeled with this educational and societal construct. The word "disability" is used when directly referencing works by other authors as they applied the term unless their work similarly use the term "dis/ability" (e.g., de Freitas, 2015).