Adaptive force is a stat that grants champions either 
attack damage or 
ability power, depending on the current amount of bonus attack damage and ability power of the champion, as follows:
Higher Bonus AD → Attack damage- Higher AP → Ability power
1 point of Adaptive Force provides 0.6 bonus AD or 1 AP.
If the attack damage and the ability power of the unit are equal, the stat granted depends on the champion.
In most cases, the League of Legends Wiki omits adaptive force in favour of displaying the amount of AD or AP granted.
Attack damage and ability power gained from abilities, including those on items like 
Dark Seal, do not contribute towards determining whether attack damage or ability power is gained with adaptive force. For example, if a champion like 
Veigar has a fully stacked Dark Seal, 100 stacks of 
Phenomenal Evil Power, and no other items, his adaptive force will be given as ability power. If he buys a 
Pickaxe, it will instead be given as attack damage, despite having considerably more ability power.
Contents
Sources of adaptive force bonuses
Champions abilities
Runes
Adaptive damage
A similar effect can be found on:
Adaptive Damage: Deals either physical or magic damage depending on your bonus statistics, defaulting based on the origin of the effect.
- Higher Bonus AD → Physical damage
- Higher AP → Magic damage
If the attack damage and the ability power of the unit are equal, the damage determined depends on the champion.
Sources of adaptive damage
Runes
Neutral Buffs
