Learner's definition of IMMERSION
[noncount]
1
: the act of putting someone or something completely in a liquid or the state of being completely in a liquid浸没；浸入 2
a : complete involvement in some activity or interest沉浸；专心；投入 b : a method of learning a foreign language by being taught entirely in that language（全部使用外语的）沉浸式外语教学