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Definition of extensiveness : The state of being extensive; wideness; largeness; extent; diffusiveness.

Synonyms:

capaciousness, bigness, generosity, copiousness, greatness, grandeur, spaciousness, hugeness, bulk, comprehensiveness, largeness, voluminousness, ampleness, expansiveness, magnificence

lengthiness, longness

Usage examples:

• Its situation certainly is all but perfect, whilst the picturesqueness and the extensiveness of its surrounding scenery are the admiration of all who see it. - "In the Border Country", W. S. (William Shillinglaw) Crockett.
• If generalities and abstractions were arranged in the order of their extensiveness and in the order of their grades, tests would be obtained which, applied to the vocabularies of the uncivilized, would yield definite evidence of the intellectual stages reached. - "Essays: Scientific, Political, & Speculative, Vol. I", Herbert Spencer.
• Even the extensiveness of the view at Eartham made his mind ache, and increased his melancholy. - "Cowper", Goldwin Smith.