• Webster's Revised Unabridged Dictionary
    • a Improvisatorial Of or pertaining to improvisation or extemporaneous composition.
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Century Dictionary and Cyclopedia
    • improvisatorial Relating to or having the power of extemporary composition, as of rimes or poems.
    • ***


In literature:

That's the way the improvisatory business is managed for visitors.
"The Gypsies" by Charles G. Leland
This accounts for the digressive, irregular, improvisatory manner of his prose.
"The Memoirs of Count Carlo Gozzi; Volume the first" by Count Carlo Gozzi

In news:

Fitzgerald gave Betts a workout every night with her improvisatory style.

In science:

Improvisatorial addition of ornaments, especially popular in playing the Baroque music, does not change the overall melody.
Music in Terms of Science