1623, in the meaning defined above
borrowed from Latin vāstitūdō "ravaged or neglected condition, immense size" from vāstus or vastus "devoid of habitation, desolate, dreary," also, "of great size, immense" + -tūdō, abstract noun suffix — more at vast entry 1
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“Vastitude.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vastitude. Accessed 16 Aug. 2022.
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