Instadict

Update: Google restricted the clipboard access to background apps since Android 10 so Instadict won't work on Android 10+

Source - https://www.xda-developers.com/android-q-blocks-background-clipboard-access/

Instadict lets you view a word's meaning anywhere!

Just copy the word and shake your device horizontally

to get it's meaning. No need to interrupt what you're doing.

It also supports full offline mode! Just download the appropriate dictionary from the link below and you're all set! It is suggested you download them for an overall better experience.

English : https://www.google.com/url?q=http://play.google.com/store/apps/details?id=livio.pack.lang.en_US

French : https://www.google.com/url?q=http://play.google.com/store/apps/details?id=livio.pack.lang.fr_FR

Italian : https://www.google.com/url?q=http://play.google.com/store/apps/details?id=livio.pack.lang.it_IT

Spanish: https://www.google.com/url?q=http://play.google.com/store/apps/details?id=livio.pack.lang.es_ES

Licenses :

jsoup : http://jsoup.org/license

Wiktionary : https://creativecommons.org/licenses/by/3.0/us/