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The Cooldown (or CD) is the minimum time a Champion has to wait in order to use abilities, item actives, or summoner spells again.
The cooldown time can be reduced with items, runes, masteries, 
Crest of Insight, and abilities to up to 45% total cooldown reduction.
See Cooldown reduction for more detailed information.
Summoner spell cooldown
All summoner spells have long cooldowns. Because of their strength and high cooldowns, strategic and tactical decisions can be made based on whether or not summoner spells are on cooldown. As such, it's important to carefully measure the best-case uses for your summoner spells.
Distortion reduces the cooldowns of 
Flash, 
Teleport, and Ghost by 20%. (Obsolete)
- Summoner spell cooldowns CANNOT be reduced by regular cooldown reduction from items such as Fiendish Codex.
Item cooldowns
Items with active abilities, such as 
Locket of the Iron Solari and 
Youmuu's Ghostblade, contain cooldowns that can be reduced with 
Intelligence. These are unaffected by cooldown reduction.
Items with passive effects with cooldowns, such as 
Guardian Angel or 
Guinsoo's Rageblade, are not reduced by cooldown reduction.
Items of the same name shares a global cooldown among them. This means using an active ability of an item will send all the same items to cooldown, in both your inventory and shop. For example, if a champion with 3 Youmuu's Ghostblade uses the activate ability of Youmuu's Ghostblade, all three Youmuu's Ghostblade will go to a 45-second cooldown. In addition, buying a new Youmuu's Ghostblade within the 45 second cooldown, the new Youmuu's Ghostblade will also be in cooldown until the remaining cooldown has refreshed.
Different items with similar effects do not share a global cooldown. A champion may have 
Hextech Gunblade and 
Bilgewater Cutlass in their inventory and may use one of the activate effect without causing both items to go on cooldown.
Champion cooldown
Static cooldowns
Static cooldowns cannot be reduced by cooldown reduction. These include:
- Udyr's stance abilities (static global cooldown)
- Corki's Missile Barrage
- Yasuo's Sweeping Blade, and Steel Tempest
Innate Passive Cooldown
Some champion's innate passive have cooldowns. These passive cannot activate while on cooldown. Innate passive cooldown cannot be reduced by cooldown reduction. These include:
- Aatrox's Blood Well
- Anivia's Rebirth
- Blitzcrank's Mana Barrier
- Evelynn's Shadow Walk (Goes on cooldown when performing any basic attacks or abilities)
- Garen's Perseverance (Goes on cooldown when taking damage from any source excluding minions)
- LeBlanc's Mirror Image
- Lissandra's Iceborn
- Malphite's Granite Shield (Goes on cooldown when taking damage from any source)
- Miss Fortune's Strut (Goes on cooldown when taking damage from non-periodic damage)
- Nocturne's Umbra Blades
- Shen's Ki Strike
- Teemo's Camouflage (Goes on cooldown when performing any action)
- Vi's Blast Shield
- Volibear's Chosen of the Storm
- Xerath's Mana Surge
- Zac's Cell Division
- Ziggs' Short Fuse
Ammo cooldowns
Ammo cooldowns is the ammo's recharge time. Ammo cooldowns can be reduced by cooldown reduction. Abilities that requires ammo can only be used while the champion has ammo and the ability is not on cooldown.
Note: Only the ammo's recharge time of these abilities is shown here, to read more information on each of these abilities, follow the link on each of them.
- Akali's Shadow Dance gains one Essence of Shadow every 30 / 22.5 / 15 seconds.
- Corki's Missile Barrage stores one missile every 12 / 10 / 8 seconds.
- Heimerdinger's H-28G Evolution Turret stores one turret every 24 / 23 / 22 / 21 / 20 seconds.
- Teemo's Noxious Trap stores one trap every 35 / 31 / 27 seconds.
- Vel'Koz's Void Rift stores one charge every 19 / 18 / 17 / 16 / 15 seconds.
- Vi's Excessive Force stores one charge every 14 / 12.5 / 11 / 9.5 / 8 seconds.
- Zyra's Rampant Growth stores seeds every 17 / 16 / 15 / 14 / 13 seconds (with the spell's passive it gives 16.7 / 15.4 / 14.1 / 12.9 / 11.7 seconds).
Delay Cooldown
Delay Cooldown are when the ability will go on cooldown once the champion has finished casting all parts of the spell, or the period of casting the spell has finished. For example, 
Ahri's 
Spirit Rush will go on to cooldown once all three dash has been perform or the time period of which to cast all three dashes have ended. These include:
- Damage Modifiers:
- Blitzcrank's Power Fist
- Garen's Decisive Strike
- Jax's Empower
- Jayce's Hyper Charge
- Leona's Shield of Daybreak
- Mordekaiser's Mace of Spades
- Nasus' Siphoning Strike
- Nidalee's Takedown
- Poppy's Devastating Blow
- Renekton's Ruthless Predator
- Rengar's Savagery
- Shaco's Deceive
- Shyvana's Twin Bite
- Sivir's Ricochet
- Talon's Noxian Diplomacy
- Trundle's Chomp
- Twisted Fate's Pick a Card
- Vayne's Tumble
- Vi's Excessive Force
- Volibear's Rolling Thunder
- Wukong's Crushing Blow
- Xin Zhao's Three Talon Strike
- Multiple Dashes like:
- Ahri's Spirit Rush
- LeBlanc's Distortion
- Renekton's Slice and Dice (only if Renekton strikes an enemy with the first dash)
- Multiple Attacks like:
- Darius' Noxian Guillotine (only if Darius lands a killing blow with the skill)
- Irelia's Transcendent Blades
- Rumble's
- Xerath's Rite of the Arcane
- ( Riven's Broken Wings is an exception to this rule)
- (
- Some Self-Buffs like:
- Other Abilities like:
