RSS \noun\ Really Simple Syndication. RSS is a collection of feed formats that allows average janes to subscribe to frequently updated content, like blogs and headline news. RSS documents (aka feeds and channels) include text and typically other info such as date and author. Feeds are read using an RSS reader typically built-in to a browser or certain email clients, such as Outlook. You can subscribe to an RSS feed by entering the web address into your reader or going to the chosen site and clicking on the subscribe button. LessJess is a weight loss fave.