What does it mean to say that Gothic architecture was disseminated?

Gothic sculpture is linked to the rise in Gothic architecture, which began at the Abbey Church of Saint-Denis (fig. 2) in about AD 1130, then spreading to the cathedrals of Sens (1140), Noyons (1150), Senlis (1151), Paris (1163), Laon (1165), and Chartres (1194). By the 13th century, Gothic architecture and sculpture had become fully developed in the cathedrals of Amiens and Reims, and spread to major towns in Britain, Iberia, and Germany.

When we say that something was disseminated, by that we basically mean that something was spread very widely. By that logic, when we say that Gothic architecture was disseminated, we're refering to the fact that it spread widely.