Select the most appropriate one-word substitution for the given group of words.

The act of thinking now about something in the past

Retrospection

The most appropriate one-word substitution for the given group of words "the act of thinking now about something in the past" is retrospection.

• Circumspection means careful consideration or deliberation.
• Introspection means the examination of one's own thoughts and feelings.
• Inspection means a thorough examination of something.

Retrospection is the act of looking back on the past and reflecting on it. It can be a helpful way to learn from our mistakes, make sense of our experiences, and gain a better understanding of ourselves.