Thanks, I had also looked for a definition. Instances of Method fulfill both of the cited criteria -- example in this thread, above. Also: Method != Proc, but t

Thanks, I had also looked for a definition. Instances of Method fulfill both of the cited criteria -- example in this thread, above. Also: Method != Proc, but the article's comments help. I, aha, notice this: $ irb 2.3.3 :001 > Kernel.method(:puts).object_id => 47165335040720 2.3.3 :002 > Kernel.method(:puts).object_id => 47165334993360 # not the same! 2.3.3 :003 > That is: #method doesn't return the Kernel.puts method, it returns a new Kernel.puts Method instance on each invocation. So the returned object from Kernel#method isn't the "real" (first-class) method object. I feel like I'm a lot closer but I'd still like a better definition :)