E-NED lists the word, and gives the etymology, but no definition.
I believe that when you take in to mind the context of the word, Dr. John B. Corbett's definition 'delighted shouts' is the closest in meaning, rather than 'strength of voice,' as shown on many sites.
Dr. John B. Corbett's definition
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from Latin hirquitallīre (of infants) to acquire a strong voice (from hircus he-goat) + -ency
From: The Works of Sir Thomas Urquhart of Cromarty, Knight
Reprinted from the Original Editions, 1834
visotactil - involving sight & touch
visuriency - desire to be looked at
tacturiency - desire to be touched
attrectation - touching with hands
gnomon - rod
definitiones logicae verificantur in rebus - logical definitions are verified by actual things
exerced act - performed act
solaecisme - error in grammar/etiquette