borrowed from Latin consentāneus "fitting, agreeable, consistent," from consentīre "to be in agreement" + -āneus, suffix forming adjectives from compound verbs — more at consent entry 1
Regarding the suffix -āneus see the etymology and note at spontaneous.
1575, in the meaning defined at sense 1
“Consentaneous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/consentaneous. Accessed 5 Dec. 2023.
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