إقامة
Iqāmah
The second call, given just before a congregational prayer begins; from the root meaning to establish.
What it means
Iqāmah comes from aqāma, meaning to set up or establish. Faruqi defines it as the beginning of ṣalāh or of any other ritual of worship. In practice the word names the call said inside the mosque just before a congregational prayer starts, in words close to those of the adhān, with the addition of qad qāmat al-ṣalāh, “the prayer has begun”. The congregation stands in rows after the call and the imam begins. The related Quranic phrase aqīmū al-ṣalāh (2:43) means to establish the prayer, which is to perform it fully and regularly. The term thus links the call with the larger idea of keeping the ritual of worship in being.
Often misunderstood as
It is sometimes called a second adhan, as if it only repeated the first, whereas it announces that the prayer itself is starting.
Term and Arabic as listed in Ismail al Faruqi, Toward Islamic English (International Institute of Islamic Thought, 1995), p. 44, listed as IQĀMAH. The definition is restated here.