Refers to a lesson conducted over the internet, often via video conferencing. Synonymous with オンライン授業, but レッスン implies a more informal or skill-based setting (e.g., language, music).
See also: オンライン授業
I take an online lesson every Saturday.
I'm learning English conversation through online lessons.
Spelling with interpunct; sometimes used for clarity.
Loanword from English 'online lesson'.