If you select some text in whatever application, there's a "define" option that will open a builtin dictionary screen:
Can this dictionary be accessed/browsed? As in, an actual application?
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.Sign up to join this community
There used to be a nice little app (that luckily I still have) that did exactly that: let you search for definitions directly. It was called Dictionary+ (link no longer available), Apple removed it reportedly for violating the
There's a replacement open source app that you can build, sign and install it manually, I haven't tried it, though: https://github.com/josh-/DictionaryPlusPlus
In recent iOS version you can also access definitions from the phone’s search (Spotlight) but for some reason sometimes it doesn’t work and may require internet.