poručík meaning in English — lieutenant, midshipman

English meaning

lieutenant noun A junior commissioned officer rank in the army, air force, or marines, ranking below captain.
midshipman noun A junior officer-in-training in a navy, ranking below an ensign or sub-lieutenant.

poručík is used for these senses in English:

lieutenant (military) The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
midshipman (nautical) An officer of the lowest rank in several navies; especially, a trainee officer.
second lieutenant The lowest rank of a commissioned officer in the United States Army, United States Air Force, or United States Marine Corps, below a first lieutenant. The rank of second lieutenant is equivalent to the naval rank of ensign.

noun A junior commissioned officer rank in the army, air force, or marines, ranking below captain.
noun A trusted deputy who carries out the plans of a more senior leader.

noun A junior officer-in-training in a navy, ranking below an ensign or sub-lieutenant.
noun A type of fish that makes a humming sound, found along the Pacific coast.