The process of forming theories or ideas based on evidence.

The act of speculating or hypothesizing about a subject.

अनुमान लगाना

English Usage: The theorisation of the reasons behind ancient civilizations has fascinated many historians.

Hindi Usage: प्राचीन सभ्यताओं के पीछे के कारणों की अनुमान लगाना कई इतिहासकारों को मोहक लगा है।