This text presents a review, characterization and discussion of the concept of solidarity in the field of practical philosophy, from the perspectives of Richard Rorty, Karl-Otto Apel and Axel Honneth. It attempts to materialize its scope and limitations in dynamic and social processes often validated through moral inclinations based on principles of justice and equality. Although dealing with distinct –and, in some cases, diametrically conflicting– approaches aiming at the practical extension of the ethical field (Rorty), at the regulatory foundation of joint responsibility (Apel), at the acknowledgment of peculiarities for the construction of common projects (Honneth), a common starting point may be identified around the question and conce...