All 6 Uses

discord
in
Brisingr
(Auto-generated)

...Eragon was convinced that taking Sloan back with them would sow [make grow] discord...
*

discord = conflict
raising their voices in a discordant melody
*

discordant = unpleasant sounding
When the entire column stood motionless before the crude altar, the creature upon the litter stirred and began to chant in a voice as discordant as the moaning of the bells.†
He retreated deep within himself, where the discordant mental chorus was no louder than the distant thunder of crashing waves.†
As Eragon pulled his blade free of the corpse, there was a discordant clamor from within the guard towers as gears and chains began to turn and the massive beams that held closed the city gates began to withdraw.†
Moving at a quick but steady pace, Eragon cut as large a hole as he could in the portcullis, then stood aside as the loose piece of grating fell flat onto the stones of the street with a discordant clang.†

Definitions:

(1) (discord as in: discord amongst the group)
conflict or disagreement -- especially among those expected to cooperate

or (especially in the form discordant):

seeming different or wrong in context
(2) (discord as in: discordant music)
unpleasant sound -- especially a combination of sounds that sound wrong together (though sometimes done intentionally in music)
(3) (meaning too rare to warrant focus)