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Aug 12, 2013 at 7:52 comment added Dietrich Burde If you talk to people about meatbelian Lie algebras, they have these articles from 1973, 1977, 1999 etc. in mind, sometimes. In this sense, it still can mean $2$-step nilpotent nowadays.
Aug 11, 2013 at 22:19 comment added YCor I wouldn't say "can still mean" for a paper from 1977 :) I would say that metabelian is confusing; anyway it's not universal in the sense that many people I know outside group theory (but who know what an extension of groups is) are not familiar with this term.
Aug 11, 2013 at 18:24 history answered Dietrich Burde CC BY-SA 3.0