What is the meaning of "Sine Qua Non"?

• Sine qua non (noun)
Example sentence: An essential condition; a thing that is absolutely necessary.
Bangla Meaning: অপরিহার্য শর্ত বা গুণ; বা বৈশিষ্ট্য।
English Meaning: Grammar and usage are the sine qua non of language teaching and learning.

• অন্যদিকে,
• Sinecure (adjective, adverb)
English Meaning: A paid position that involves little or no work
Bangla Meaning: যে পদের জন্য মর্যাদা বা সম্মানী আছে কিন্তু তেমন কাজ বা দায়িত্ব নেই।
Example sentence: Despite having little actual responsibility, he enjoyed the financial benefits of his sinecure.

• Sine Prole (adjective, adverb)
English Meaning: Without offspring; childless.
Bangla Meaning: সন্তান ছাড়া; নিঃসন্তান।

• Sine die (adverb)
English Meaning: (with reference to business or proceedings that have been adjourned) with no appointed date for resumption.
Bangla Meaning:  অনির্দিষ্টকালের জন্য।
Example sentence: The case was adjourned sine die.

Source:
1. Accessible Dictionary by Bangla Academy.
2. Oxford Learner's Dictionary.
3. Cambridge Dictionary.
4. website Lecture.
5. Collins Dictionary.