This is a list of each of Cid's Limit Breaks, it's effect, and a brief description. The letters and numbers mean the Break Level and which one it is (i.e. B3/1 is Level 3, 1st Break):

B1/1: BOOST JUMP

Cid performs a diving slash to one enemy.

B1/2: DYNAMITE

Using his cigarette, Cid lights a stick of dynamite and tosses it at his enemies, causing a damaging explosion.

B2/1: HYPER JUMP

Cid spins into the sky and drives his weapon into the ground, which is covered in a blue light. Upon pulling it out, all enemies are damaged.

B2/2: DRAGON

A serpent-like dragon flies from behind Cloud and encircles one enemy before flying away. HP and MP stolen from the target are given to Cid.

B3/1: DRAGON DIVE

Cid leaps in the air and comes down with his weapon 6 times, creating a column of multi-colored energy each time he lands that causes damage.

B3/2: BIG BRAWL

Cid pokes and impales opponents with his weapon 8 times while dust rises around him.

B4/1: HIGHWIND

Cid calls down a barrage of missiles (from the Highwind, I guess?) to strike all enemies repeatedly.