1. forms a theory or theories about something; speculates or hypothesizes
Usage: British spelling; American spelling is ‘theorizes’

Examples

• The scientist theorises that climate change affects migration patterns.
• She theorises about the origins of the ancient civilization.
• The detective theorises that the crime was committed by someone familiar with the building.
• He theorises that social media influences political opinions.
• The researcher theorises a connection between diet and mental health.
• The professor theorises about quantum mechanics in her latest paper.