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Supposition (noun)

Synonyms: Suspicion (সন্দেহ; সংশয়; অবিশ্বাস), Belief (বিশ্বাস; আস্থা), Assumption (অনুমান), Hypothesis (পূর্বানুমান), Impression (প্রভাব)।
Antonyms: Fact (প্রকৃত ঘটনা), Certainty (নিশ্চয়তা), Assurance (আত্মপ্রত্যয়; আত্মবিশ্বাস), Confidence (আত্মবিশ্বাস), Reality(বাস্তবতা)।

English Meaning: An idea that something may be true, although it is not certain.
Bangla Meaning:
(১) [uncountable noun] অনুমান, কল্পনা।
(২) [countable noun] অনুমান, আন্দাজ, আঁচ।
on this supposition; on the supposition that ...যদি ধরে নেওয়া যায় যে…।
Other Forms: Suppositional (adjective).

Example Sentence:
1.They were working on the supposition that his death was murder.
2. Every society is built upon certain suppositions.

Source: BCS Admission Lecture.