I seemed to have found a solution to my own 'Question' above-- By doing another search, at support.apple.com, and then following the instructions to 'remove' the 'Dictionary App' from the Dock. -- Thus-- in using the Dock area, and clicking the 'Dictionary' app and hovering it just above the 'Dock' area bar, until the 'Remove' bar appeared, and let it go. It's gone only from the Dock, but as it was explained, in doing this, I would only be 'removing' the 'Alias' not the entire Dictionary application. Next, I went to the Launchpad icon {found in the Dock and opened it], then clicked the Dictionary App, and slid it back onto the Dock, and voila! - all the tabs in the 'Dictionary App' were active, whereas before only 1 tab in the Dictionary app actively worked which was 'WikiPedia' not the 'All', "Dictionary", 'Thesaurus' or 'Apple' tabs. Now they all are working. Fairly simple solution actually.