(Cdr) The chief commissioned officer of a military unit whatever their rank (army, navy and air force)
Commander was the commissioned rank above lieutenant and below captain. Cook and Furneaux were both commanders on the second voyage while Clerke (and subsequently Gore and King when they took over) held this rank on the last voyage.
an officer in command of a military unit
a commissioned naval officer who ranks above a lieutenant commander and below a captain
an officer in the airforce
Any card which is leading a command. This could be any of the following: a leader card, a lone cavalry unit, the leading unit in a cavalry pair or a naval squadron leading an invasion. A subordinate leader is not considered a commander. Neither is a lone infantry unit.
This is the shuttle officer in charge of all shuttle mission specialists. He/she also maintains the appropriate life-support gas levels in the shuttle.
Commander is a military rank which is also sometimes used as a military title depending on the individual customs of a given military service. Commander is also used as a rank or title in some organizations outside of the military, particularly in police and law enforcement.
Commander is a commissioned Starfleet officer rank in the fictional Star Trek universe. Lieutenant commanders (including Data and Tuvok) are sometimes also referred to as "Commander."