You have a smartphone, but you haven't any dictionary apps on it. So your smartphone is not enough smart!!!
Smart means always better , smartly looking in outside!! its not. Yes looking better in outside its a part of smartness, but how you utilize smartly its the most important part here. So, here i added 5 best dictionary apps that you can use in your android phone!
1). Dictionary – Merriam-Webster
Top android dictionary and offline. Comes with definitions, synonyms, antonyms, words of the day, words puzzle and much more. Google Play Link
2). Dictionary.com
Best dictionary apps. Its offline, you can use anywhere without internet. Only voice search need an internet connection. Google Play Link
3). Mobisystems Oxford Dictionary of English : Free
The very latest vocabulary, with over 350,000 words, phrases and meanings. With more learning tools like "Learn a new word every day with our ‘Word of the day’ option". Google Play Link
4). U-Dictionary: Best English Learning Dictionary
It has great feature like Camera Translation(Translate words quickly by using the offline OCR technology). Only 17MB installation package. Google Play Link
5). Offline dictionaries
Its another best offline dictionary. It allows you to browse dictionaries without a network connection. Lots of language. User friendly. Google Play Link
Hope this post will be helpful for you.