Online learning here is used as a blanket term for all related terms:

• HyFlex courses – hybrid + flexible
  “hybrid synchronous” or “blended synchronous” courses
  • Definition:
    The HyFlex model gives students the choice to attend class in person or via synchronous remote stream and to make that choice on a daily basis. In other words, unlike online and hybrid models which typically have a fixed course structure for the entire semester, the HyFlex model does not require students to make a choice at the beginning of term and then stick with it whether their choice works for them or not; rather students are able to make different choices each day depending on what works best for them on that day (hence the format is “flexible”) (Miller and Baham, 2018, to be published in the Proceedings of the 10th International Conference on Teaching Statistics).
  • Definition from Horizon Report, HIgher Ed edition, 2014. p. 10 integration of Online Hybrid and Collaborative Learning
  • Definition from U of Arizona (https://journals.uair.arizona.edu/index.php/itet/article/view/16464/16485)
    Beatty (2010) defines HyFlex courses to be those that “enable a flexible participation policy for students whereby students may choose to attend face-to-face synchronous class sessions or complete course learning activities online without physically attending class”

• Online courses
  • Definition
    Goette, W. F., Delello, J. A., Schmitt, A. L., Sullivan, J. R., & Rangel, A. (2017). Comparing Delivery Approaches to Teaching Abnormal Psychology: Investigating Student Perceptions and Learning Outcomes. Psychology Learning and Teaching, 16(3), 336–352. https://doi.org/10.1177/1475725717716624
    p.2.Online classes are a form of distance learning available completely over the Internet with no F2F interaction between an instructor and students (Helms, 2014).
  • https://www.oswego.edu/human-resources/section-6-instructional-policies-and-procedures
    An online class is a class that is offered 100% through the Internet. Asynchronous courses require no time in a classroom. All assignments, exams, and communication are delivered using a learning management system (LMS). At Oswego, the campus is transitioning from ANGEL  to Blackboard, which will be completed by the Fall 2015 semester.  Fully online courses may also be synchronous. Synchronous online courses require student participation at a specified time using audio/visual software such as Blackboard Collaborate along with the LMS.
  • Web-enhanced courses

Web enhanced learning occurs in a traditional face-to-face (f2f) course when the instructor incorporates web resources into the design and delivery of the course to support student learning. The key difference between Web Enhanced Learning versus other forms of e-learning (online or hybrid courses) is that the internet is used to supplement and support the instruction occurring in the classroom rather than replace it.  Web Enhanced Learning may include activities such as: accessing course materials, submitting assignments, participating in discussions, taking quizzes and exams, and/or accessing grades and feedback.”

More information:

Blended Synchronous Learning project (http://blendsync.org/)

https://journals.uair.arizona.edu/index.php/itet/article/view/16464/16485

https://www.binghamton.edu/academics/provost/faculty-staff-handbook/handbook-vii.html