G4357 προσμένω (prosménō)

KJV renderings: abide still, be with, cleave unto, continue in (with)
Strong's definition: to stay further, i.e. remain in a place, with a person; figuratively, to adhere to, persevere in
Derivation: from G4314 (πρός) and G3306 (μένω);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.