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Focal-plane : குவிமையத்துக்குரிய தளம்.

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[3] Historical Dictionary: When a word was first coined, what was its spelling and meaning during the first coinage, when did its spelling, pronunciation and meaning change, and what is the current form and meaning of the word as described in the dictionary, so E. Historical Dictionary. E.g., The Shorter Oxford English Dictionary. The dictionary from which the word focal-plane is derived has many meanings in the historical dictionary. But The Shorter Oxford English Dictionary is the best.

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