This is the verse translation, not a definition of the individual word.
And from among those who say, “We are Christians,” We took a covenant from them, but they forgot a part of what was enjoined upon them[1]. So We induced hostility and hatred among them[2] until the Day of Resurrection, and Allah will inform them of what they used to do.
Source
[1] Concerning the coming of Prophet Muhammad (ﷺ) in the Injeel (Gospel).
[2] Among their various denominations or sects.