BLENDKIT_Blended courses (also known as hybrid or mixed-mode courses) are classes where a portion of the traditional face-to-face instruction is replaced by web-based online learning.

OLC_a course where 30%-70% of the instruction is delivered online

EDUCAUSE_Blended learning mixes F2F and non-F2F activities, some performed synchronously, some asynchronously. As such, blended learning provides the flexibility to address a broad range of curricular and institutional needs, opportunities, and goals. For more click here

Abrams & Haefner, 2002; Bender 2006_Combines personal interaction from live class sessions with online education for greater learning flexibility (Bender, Vredevoogd, 2006)

MIT (J. Pankin, J. Roberts, M. Savio, 2012)_We define blended learning as structured
opportunities to learn, which use more than one learning or training method, inside or outside the classroom.

KINEO_The Oxford Group_2013&2014_Blended learning is the seamless integration of online and offline learning methods. These methods can be formal and informal in the way they are created or accessed.

RYERSON UNIVERSITY_2012_No definition, just methodology description

References

Abrams, G. & Haefner, J., 2002, ‘Blending online and traditional instruction in the mathematics classroom’, in The Technology Source, available here

Bender, D. M., & Vredevoogd, J. D. (2006). ‘Using Online Education Technologies to Support Studio Instruction’, Educational Technology & Society, 9 (4), 114-122.

Pankin, J., Roberts, J., Savio, M., 2012, ‘Blended Learning at MIT’, available here

Thompson, K., ‘Undwerstanding Blended Learning’, available here