المقتدر
كلمة (المقتدر) في اللغة اسم فاعل من الفعل اقْتَدَر ومضارعه...
One who joins the congregational prayer from the beginning but then misses one or more "rak‘ah" (unit of prayer).
The "lāhiq" (defaulter) is the person who joins a congregational prayer from its beginning but then misses one or more "rak‘ahs" in the middle or end of such prayer. This may take place for a valid excuse, such as inattention, sleeping, or crowdedness, or without an excuse, such as bowing or prostrating before the imam.
"Lāhiq": the one reaching and achieving something. It is derived from "lahāq", which means achieving, reaching, catching up.
The one who joins a congregational prayer after missing some parts.