The action, or an act, of showing or making known beforehand; indication or manifestation in advance.
Apparently not recorded between the 17th and 20th centuries..
Origin
Late Middle English; earliest use found in Mirour of Mans Saluacioune. From post-classical Latin praemonstration-, praemonstratio action of showing beforehand, preliminary indication from classical Latin praemonstrāt-, past participial stem of praemonstrāre + -iō.