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Geological Survey : நிலப்பொதியியல் அளவீடு

[1] Monolingual Dictionary: Here a word in a language is interpreted in that language. Such as Tamil to Tamil, English to English. The word geological survey is taken from English to Tamil dictionary.

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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 geological survey 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 geological survey, many words from the subject dictionary can be found here. There are several dictionaries available on the market.