1) to remain in, continue
2) to persevere in anything, a state of mind etc.
3) to hold fast, to be true to, abide by, keep
Part of Speech: verb
Citing in TDNT: 4:576, 581
From G1722 and G3306; to stay in the same place, that is, (figuratively) to persevere: - continue.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἐμμένω; click on the second column to search for that grammatical form of the root ἐμμένω; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐμμένω.