1) to preserve (a thing from perishing or being lost)
2) to keep within one's self, keep in mind (a thing, lest it be forgotten)
Part of Speech: verb
Citing in TDNT: 8:151, 1174
From G4862 and G5083; to keep closely together, that is, (by implication) to conserve (from ruin); mentally to remember (and obey): - keep, observe, preserve.
|b keep in mind||29.1|
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 συντηρέω; click on the second column to search for that grammatical form of the root συντηρέω; click on the third column to search for that word and grammatical form; click on the total to search for the root συντηρέω.