Found 5 Strong's definitions.
from προσκαρτερέω; persistancy:--perseverance.
from πρός and εὔχομαι; to pray to God, i.e. supplicate, worship:--pray (X earnestly, for), make prayer.
from προσεύχομαι; prayer (worship); by implication, an oratory (chapel):--X pray earnestly, prayer.
from δέομαι; a petition:--prayer, request, supplication.
ultimately from Α (as negative particle) and ὕπνος; to be sleepless, i.e. keep awake:--watch.
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