investigate

verb

in·​ves·​ti·​gate in-ˈve-stə-ˌgāt 

investigated; investigating

transitive verb

: to observe or study by close examination and systematic inquiry

intransitive verb

: to make a systematic examination

especially : to conduct an official inquiry

investigation

in-ˌve-stə-ˈgā-shən 

noun

investigative

in-ˈve-stə-ˌgā-tiv 

adjective

investigatory

in-ˈve-sti-gə-ˌtȯr-ē 

adjective

Synonyms of investigate

• explore
• examine

Examples of investigate in a Sentence

The police are still investigating the murder.

The accident was thoroughly investigated.

The manager promised to investigate when we pointed out an error on our bill.

He was investigated for his involvement in the incident.

Recent Examples on the Web

It should be investigated as a crime from the very beginning. — Stepheny Price, FOXNews.com, 5 July 2026

Fireworks were going off in the area as police continued to investigate. — Lillie Davidson, Fort Worth Star-Telegram, 5 July 2026

About 10 Democratic senators and House members are investigating the pool project. — Steve Peoples, Fortune, 5 July 2026

Counties investigate these cases, and officials acknowledge that fraud exists, but neither the state nor local property appraisers publish verifiable statewide fraud statistics. — Sun Sentinel Editorial Board, Sun Sentinel, 5 July 2026

Word History

Etymology

Latin investigatus, past participle of investigare to track, investigate, from in- + vestigium footprint, track

First Known Use

15th century, in the meaning defined at transitive sense

Rhymes for investigate

• abbreviate
• accelerate
• accommodate
• accumulate
• acuminate
• adjudicate
• adulterate
• affiliate
• agglomerate
• agglutinate
• alleviate
• amalgamate

Kids Definition

investigate

verb

in·​ves·​ti·​gate in-ˈves-tə-ˌgāt 

investigated; investigating

: to study by close examination and systematic inquiry

investigation

-ˌves-tə-ˈgā-shən 

noun

investigative

-ˈves-tə-ˌgāt-iv 

adjective

investigator

-ˌgāt-ər 

noun

investigatory

-ˈves-ti-gə-ˌtōr-ē 

-ˌtȯr-

adjective

Etymology

from Latin investigare "to track, investigate," from in- "in, toward" and vestigium "footprint" — related to vestige

Word Origin

A detective investigating a crime may find the criminal by following clues. In much the same way, a hunter may find game by following tracks. The origins of the word investigate show how fitting it is to compare the detective to the hunter. The Latin word vestigium meant "footprint, track." Joined with the prefix in-, the noun vestigium gave rise to the verb investigare. This word meant both "to track or trace by footprints" and "to study or examine closely." Only the second meaning was kept when the verb was borrowed into English as investigate.

Legal Definition

investigate

verb

in·​ves·​ti·​gate in-ˈves-tə-ˌgāt 

investigated; investigating

transitive verb

: to observe or study by close examination and systematic inquiry

specifically : to make (a criminal suspect) the subject of inquiry and study for the purpose of establishing probable cause

intransitive verb

: to make a systematic examination

especially : to conduct an official inquiry

investigation

in-ˌves-tə-ˈgā-shən 

noun

investigative

in-ˈves-tə-ˌgā-tiv 

adjective

investigator

-ˌgā-tər 

noun

investigatory

in-ˈves-tə-gə-ˌtōr-ē 

adjective