This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Sport stacking.

n. A stacked arrangement of often aromatic molecules, adopted due to interatomic interactions.

v. Present participle of stack.

a. & n. from stack.

"And I think if you look end-to-end in that process, when you actually look at what we call the stacking of conservatism on the basic stochastic model, I mean we don't know."

stacking belt   

stack   

stack   

attacking    backing    cracking    hacking    jacking