Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of [Recall Knowledge](/Actions.aspx?ID=26) checks related to these creature is increased by 2.
Concentrate
An action with this trait requires a degree of mental concentration and discipline.
Focus
A spell you can cast by spending a Focus Point, and that is automatically heightened to half your level rounded up.
Wizard
This indicates abilities from the wizard class.
source: Player Core pg. 388
spell_type: Focus
trigger: A creature within 30 feet casts an arcane spell
type: Spell
You gather the embers of another caster’s spell, using your understanding of unified magic to pick apart their formulas and incantations well enough to imitate the spell yourself, if only for a short time. Until the end of your next turn, you can Cast the triggering Spell by expending a wizard spell slot of the same rank. That caster’s spells can’t trigger your interdisciplinary incantation again for 24 hours.