acceleratory
/ˌæksəˈlɛrətɔri/ or /ˌæksəˈlɛrətɔri/ is not accurate, the pronunciation is /ˌækəˈlɛrətɔri/ or /ˌæksəˈlɛrətɔri/Definitions
1. adjective
relating to or causing acceleration
“The company’s innovative technology has an acceleratory effect on its products’ development.”
2. noun
something that causes acceleration
“The acceleratory forces acting on the spacecraft threatened its stability.”