CDR
Cooldown reduction
Example
I'm building for cdr so I can spam my Q attack
cdr definition by Slang.net - The Slang Dictionary
This page explains what the acronym "cdr" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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In League of Legends (LoL), items and abilities that grant cdr reduce a champion, item, or spell's cooldowns (cd). This allows you to use the affected abilities more frequently.
For example, Luden's Echo grants 10% cdr, meaning a champion can reuse their ult and other abilities 10% more quickly. You may also see cdr referred to as ability haste, because Riot renamed the cooldown reduction stat to ability haste in LoL version 10.23.