to suppose that something is true without having evidence to confirm it

यह मान लेना

English Usage: I surmise that they will arrive late due to the traffic.

Hindi Usage: मैं मान लेता हूँ कि वे ट्रैफिक के कारण देर से पहुँचेंगे।

a guess or assumption based on limited evidence

अनुमान

English Usage: Her surmise about the outcome of the meeting turned out to be correct.

Hindi Usage: उसकी बैठक के परिणाम के बारे में अनुमान सही निकला।