investigation
This word is most commonly used in formal contexts, such as law enforcement, science, or official corporate reports. It is a countable noun. You can have 'an investigation' (singular) or 'multiple investigations' (plural). When talking about the subject being studied, it is usually followed by the preposition "into" (e.g., an investigation into the crime).
💬Casual Conversation
🎬Floating in the observation deck of a cruiser during a long haul.
Zorg
I'm doing a deep-dive investigation into why humans eat 'tacos' on Tuesdays.
Lt. Vega
Drop it, Zorg. You're just overthinking a marketing gimmick.
💡
Zorg treats a mundane human tradition as a serious academic or forensic study (investigation), while Lt. Vega uses the phrasal verb 'drop it' to tell him to stop talking about it, highlighting their contrast in intensity and seriousness.