The act or process of examining a crime, problem, statement, etc. A careful examination or search in order to discover facts or gain information. The president has promised a full … To do this, seek out details associated with its disappearance, asking questions and gathering evidence in order to find out … What does investigation mean? The meaning of investigate is to observe or study by close examination and systematic inquiry. An investigation is a thorough search for facts, especially those that are hidden or need to be sorted out in a complex situation. · federal prosecutors are in the early stages of an investigation into the office of new york attorney general letitia james, who brought a civil fraud case against president donald … How to use investigate in a sentence. An investigation of a bank failure. Definition of investigation noun from the oxford advanced learners dictionary. An investigation is a systematic, minute, and thorough attempt to learn the facts about something complex or hidden; Carefully, especially to…. The goal of an investigation is usually … Investigation is the systematic process of gathering and analyzing information or evidence to uncover facts, identify causes, determine motives, and find a solution or resolution to a specific … An official examination of the facts about a situation, crime, etc. The act or process of investigating: It is often formal and official: See synonyms at inquiry. · in a securities filing, unitedhealth said it has begun complying with formal criminal and civil requests from the doj. If something has gone missing, conduct an investigation to find it. A politician under investigation.