The incorrectly spelled word is "involv."

The correct spelling is "involve," which means to include or incorporate someone or something as a necessary or integral part.

The other options, "Investigate," "Invite," and "Invent," are spelled correctly and have the following meanings:

• Investigate: Refers to the act of conducting a systematic inquiry or examination to gather information or evidence.
• Invite: Means to request or ask someone to come or go somewhere, typically for a social gathering or event.
• Invent: Describes the process of creating or producing something new or original, typically through one's imagination or ingenuity.