Is “Accelerando” a Scrabble word?
Yes
ACCELERANDO
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Accelerando
/æksɛləˈɹændəʊ/
noun
1.A tempo mark directing that a passage is to be played at an increasing speed.
2.A passage having this mark.
3.(by extension) Accelerating or exponential advancement or development (of a thing).
adverb
1.With a gradual increase in speed