Like IOS App iBook there is a feature , if u don't the meaning of any word u can just hold that word for 2-3 sec, u will automatically get the meaning of that word but I didn't found this feature into adobe acrobat reader and I don't think so that this feature take so much work it simply done with add a dictionary.
So please have attention on this feature and let me know if there is any alternative of this.
[topic moved to Reader/Acrobat DC for Mobile forum]
Unfortunately, we don't support this feature right now. We have taken note of this feature request and would try to incorporate it in the application in future releases.
Acrobat DC Mobile Team
Three years have passed since this question was originally posted, are there any news on adding this feature?