Which linguistic feature was specifically addressed in Amazon's 2018 major update to Alexa's voice commerce capabilities, dramatically improving its retail conversion rates?

Voice commerce is revolutionizing retail by allowing consumers to shop using natural language commands. This emerging technology relies heavily on linguistic understanding, dialect processing, and natural language parsing. But how well do you understand the linguistic foundations that power today's voice commerce platforms? Test your knowledge about the intersection of linguistics and retail technology in this challenging trivia question!

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Phonological variations in regional accents
Syntactic parsing of compound requests
Semantic disambiguation of product categories
Pragmatic understanding of conversational implicature