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Wiktionary
microlearning

n. learn in relatively small units and through short activity.

Wikipedia
Microlearning

Microlearning deals with relatively small learning units and short-term learning activities. Generally, the term "microlearning" refers to micro-perspectives in the context of learning, education and training. More frequently, the term is used in the domain of e-learning and related fields in the sense of a new paradigmatic perspective on learning processes in mediated environments.