Boyd’s Bible Dictionary:
(gatherings). Probably store-rooms in the Temple (1 Chron. 26:15,17). “Thresholds” (Neh. 12:25).
Concise Bible Dictionary:
In 1 Chronicles 26:15,17 the Hebrew word is given untranslated; but the same occurs in Nehemiah 12:25, where it is translated “thresholds,” and in the margin “treasuries.” It probably refers to the apartments used as storehouses in the outer temple.
Jackson’s Dictionary of Scripture Proper Names:
the gatherings