Definitions

1. verb

to unite or form a league or alliance, especially for mutual defense or support

“The neighboring states confederated to fight against the enemy’s invasion.”

2. noun

a person who unites or is united with others in a league or alliance, especially for mutual defense or support

“The confederate leader negotiated a peace treaty with the opposing forces.”

3. noun

a league or alliance, especially one formed for mutual defense or support

“The confederacy of states was established to protect their sovereignty.”