What do you see as a "boss"?

[Space Core]

Kind of a weird title, but what do you see as a boss? An enemy with relatively high HP/who needs a large amount of hits to defeat, or an enemy who is placed at a significant point in the storyline?

 

[The14Pugs]

A boss is an enemy that has badass battle music and constantly kicks your ass to the point you need to ask your older brother to help you beat him...

At least, that's how I remembered bosses as a kid.

 

[CM30]

Hard to say. I would say 'either of the above options', since I'd count both as a boss... but I guess the former more technical viewpoint is my main one. A boss should take lots of hits, have a more complex attack pattern than a normal enemy and generally present more of a challenge to the player.