The term 'Amazon Millieu' refers to the online retail environment created by Amazon.com. The two crossword solutions, WEB and ETAIL, are both related to this environment. WEB stands for World Wide WEB, which is the global system of interconnected computer networks that enables users to access information from around the world. ETAIL stands for electronic retailing, which is the process of selling goods and services over the internet. Together, these two solutions provide an overview of the Amazon Millieu, which is the online retail environment created by Amazon.com.