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Radio Activity : கதிரியக்கம்

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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 radio activity is derived has many meanings in the historical dictionary. But The Shorter Oxford English Dictionary is the best.

[4] Subject Dictionary: In this dictionary, everything related to any subject is arranged and explained according to the dictionary. For example — Dictionary of History, Dictionary of Botany, Dictionary of Economics. In addition to radio activity, many words from the subject dictionary can be found here. There are several dictionaries available on the market.