Definition of "summa"

In size, scope, and graphic ambition [the map] is a summa of the mapping art of the day, represented in paint by Vermeer.

1987, Svetlana Alpers, “The Mapping Impulse in Dutch Art”, in David Woodward, editor, Art and Cartography: Six Historical Essays, page 57

The painting is a “summa” of the various trends that intertwined and developed during those crucial years of the early sixteenth century in Florence.

1993, Franca Falletti, The David and the Accademia Gallery, page 6

Rockefeller Center is at once a summa of the Art Deco style, and a look ahead to the Internationalist style that dominated after World War II.

1999, Eric Nash, Manhattan Skyscrapers, page 93