What does "commanding officer" mean?

The officer in command of, and typically having ultimate authority over, a military unit.

What is a synonym for "commanding officer"?

Common synonyms include: aide, brass, brigadier, brigadier, captain, centurion.

noun

noun ·Rare ·Advanced level

Noun

1
The officer in command of, and typically having ultimate authority over, a military unit.
2
an officer in command of a military unit wordnet