What does IE mean by saying "'console' is undefined"?

What does IE mean by saying "'console' is undefined"?

I like IE's persnicketiness (the debugging tools that take you right to
your code is even more user-friendly than what I've found in F12 Chrome
Dev Tools), but why does it say, "'console' is undefined" re: this line of
jQjuery:
console.log("entered submit button click");
How could console be undefined? Neither Chrome nor Firefox complain about
it...
And ironically, IE shows me this error message where? In the "Console"
tab! Shirley it couldn't be case-sensitive, and it expects "Console.log"?
BTW and anyway, I'm impressed with IE's F12 tools; I wonder if it's "The
Avis Effect" at work - they were #5 (among Browsers) and have thus begun
fighting like a rabid wolverine to claw and scratch their way upwards?