lieutenant

lieutenant — noun

1. A person who holds a middle-level position in the military's officer hierarchy.

1.nounB1
Definition

A person who holds a middle-level position in the military's officer hierarchy. In the army and air force, a lieutenant is one grade above a second lieutenant and one grade below a captain, and usually leads a platoon. The same title is used in the navy for the rank that falls between ensign and lieutenant commander.

Example

Lieutenant Mauricio led his platoon on a training exercise near the border.

lieutenant + led a platoon — typical rank role

After four years at the academy, Min was promoted to lieutenant in charge of a patrol boat.

promoted to lieutenant — common collocation

Common collocations
  • promoted to lieutenant
  • lieutenant in the army / navy / air force
  • first lieutenant
  • second lieutenant
  • lieutenant colonel
  • lieutenant in command of [a platoon / a squad / a patrol]
Synonyms
  • officer

    Broader term; any person holding a commissioned rank in the armed forces, not specifically the middle grade

  • platoon leader

    Describes the role rather than the rank — a lieutenant typically serves as a platoon leader, but other ranks can fill the same role

  • subaltern

    A British term for a commissioned officer below the rank of captain, used mainly in formal or historical contexts

Usage Note

Pronunciation varies: British English /lɛfˈtɛnənt/ (LEF-ten-ənt), American English /luːˈtɛnənt/ (loo-TEN-ənt). British speakers also use 'leftenant' for the naval rank, while the US Navy pronounces it the same as the army rank.

Common Mistakes

The lieutenant saluted the general and said, "Yes, sir, I am lieutenant.
The lieutenant saluted the general and said, "Yes, sir.
Do not use 'lieutenant' as a self-identifying title in direct address; use it before a surname ('Lieutenant Mauricio') or alone as a form of address ('Good morning, Lieutenant.').

2. A police officer or firefighter whose rank comes one step below captain. A lieut

2.nounB1
Definition

A police officer or firefighter whose rank comes one step below captain. A lieutenant usually supervises other officers or firefighters at the scene of an incident and reports to the captain.

Example

Lieutenant Adisa arrived at the burning building before the fire trucks and started directing traffic.

lieutenant + directing at scene — supervisory role

Lieutenant Walid questioned the witness while the other officers searched the apartment for evidence.

Common collocations
  • police lieutenant
  • fire lieutenant
  • promoted to lieutenant
  • Lieutenant [name] of the [city] police / fire department
Synonyms
  • inspector

    Commonwealth equivalent rank in police forces; roughly the same level but different title

  • deputy captain

    Describes the rank relationship more than the official title

Usage Note

This sense is most common in US police and fire departments. In the UK and other Commonwealth countries, the equivalent rank in police forces is usually 'inspector' or 'chief inspector'.

Common Mistakes

The fire lieutenant drove the fire truck to the station.
Lieutenant Adisa arrived at the scene and coordinated the firefighters.
'Lieutenant' in fire departments implies supervisory responsibility, not just any firefighter role.

3. A person chosen by someone of higher rank to act on their behalf or help manage

3.nounB2
Definition

A person chosen by someone of higher rank to act on their behalf or help manage their responsibilities. In business, politics, or organised groups, a lieutenant speaks for the leader and carries out important tasks.

Example

The CEO sent her trusted lieutenant Christopher to negotiate the merger in London.

trusted lieutenant — common collocation for deputy role

As the boss's lieutenant, Henrik handled all payments to outside contractors.

Common collocations
  • trusted lieutenant
  • loyal lieutenant
  • serve as lieutenant to [someone]
  • the president's / boss's / leader's lieutenant
Synonyms
  • deputy

    The most direct synonym; 'deputy' is more formal and neutral, while 'lieutenant' sometimes implies loyalty or a personal bond

  • second-in-command

    Emphasises the hierarchical position as the immediate subordinate

  • assistant

    A more general term that does not imply the authority to act in the leader's place

  • right-hand man / right-hand person

    Informal expression emphasising trust and close working relationship

Usage Note

The historical root meaning — 'one who holds the place of another' (from French lieu-tenant). This sense is used outside military contexts to describe any trusted deputy. It can carry a slightly informal or even conspiratorial tone (e.g. 'a crime boss and his lieutenants').

Common Mistakes

The manager's lieutenant is a type of soldier.
The manager's lieutenant handles day-to-day operations.
The word 'lieutenant' can refer to any trusted deputy, not just military personnel.

Word family

  • first lieutenant
    nounB1
  • second lieutenant
    nounB1
  • lieutenant colonel
    nounB2
  • lieutenant commander
    nounB2
  • lieutenant general
    nounB2
  • lieutenant governor
    nounB2
  • lieutenancy
    nounC1

Synonym discussion

Sense: noun/1

All four words refer to commissioned ranks in the armed forces, but they occupy different levels in the hierarchy. 'Officer' is the broadest term, encompassing anyone from a second lieutenant to a general — it contrasts with 'enlisted personnel.' 'Captain' is the direct superior of an army lieutenant: a lieutenant takes orders from and reports to a captain. 'Ensign' is the entry-level officer rank in the US Navy and Coast Guard, sitting one step below a lieutenant. 'Commander' is a higher naval rank (above lieutenant commander); using 'commander' when you mean 'lieutenant' would overstate the person's seniority. In everyday usage: 'Lieutenant Mauricio reports to Captain Torres, who reports to Commander Chen.'

officer ↗captain ↗ensigncommander ↗

Common collocations

Nouns

  • first lieutenant
  • second lieutenant
  • lieutenant colonel
  • lieutenant commander
  • lieutenant general
  • lieutenant governor

Phrases

  • lieutenant in command
  • serve as lieutenant
  • promoted to lieutenant

Etymology

FrenchMiddle EnglishEnglish

Lieutenant entered English from French in the late Middle Ages. It is built from 'lieu' (place) and 'tenant' (holding), so the literal meaning is 'holding the place' of someone else — that is, a deputy who acts in a superior's absence. The military rank developed from this original idea: a lieutenant was the officer who stood in for the captain. The two pronunciations (British /lɛfˈtɛnənt/ and American /luːˈtɛnənt/) both derive from the same French source, with the British form preserving an older spelling pronunciation that treated the 'u' as 'v' (liev-tenant).