1.  fenestration(n = noun.attribute) - the arrangement of windows in a building;
is a kind of arrangement, placement

2.  fenestration(n = noun.act) - surgical procedure that creates a new fenestra to the cochlea in order to restore hearing lost because of osteosclerosis;
is a kind of operation, surgery, surgical operation, surgical procedure, surgical process

1.  The arrangement and proportioning of windows; -- used by modern writers for the decorating of an architectural composition by means of the window (and door) openings, their ornaments, and proportions. [1913 Webster]

2.  The state or condition of being fenestrated. [1913 Webster]

fenestration, n.
1 Archit. the arrangement of windows in a building.
2 Bot. & Zool. being fenestrate.
3 a surgical operation in which a new opening is formed, esp. in the bony labyrinth of the inner ear, as a form of treatment in some cases of deafness.