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1. The act of setting in operation
   "repeated shutdowns and startups are expensive"
    
2. The act of starting a new operation or practice
   "the startup of the new factory was delayed by strikes"
   - inauguration

1. Get going or set in motion
   "start up the computer"
   - start
    
2. Get off the ground
   "Who started up this company?"
   - start, embark on, commence

Derived forms: started up, starting up, startups, starts up

Type of: begin, beginning, commence, commencement, lead off, start

Encyclopedia: Start up