The Pivot Was Always There; Someone Just Named It
A deliberate structural change in response to evidence: the definition existed before the dictionary entry did.

01 / VocabularyWhat the Word Actually Means
Eric Ries defined pivot formally in The Lean Startup (2011) as a structured course correction that tests a new fundamental hypothesis about a product, business model, or growth engine — while preserving what has already been learned. The key clause is that last one. A pivot is not a restart; it is a reuse of existing capital, code, or customer insight in a different direction. Steve Blank's parallel work on customer development, published through his Stanford courses and blog from the mid-2000s onward, supplied much of the underlying logic.
The practice, however, predates the vocabulary by decades. What Ries named in 2011 is what surviving companies had always done when the original thesis broke.

02 / VocabularyThree Cases That Fit the Definition

Slack launched in August 2013 as the internal messaging tool built for Glitch, a multiplayer game that Stewart Butterfield's company Tiny Speck had spent years developing. Glitch failed; the messaging layer did not. The team discarded the game and shipped the tool — exactly the Ries model: one element (the communication infrastructure) preserved, the hypothesis about the product entirely changed.
YouTube launched in 2005 as a video-dating site before its founders recognised that users were uploading anything at all, and redirected the platform accordingly. PayPal arrived at online payments only after abandoning its original concept as cryptography software for Palm Pilots. Neither company's founders used the word pivot at the time; both executed the thing the word would later describe.
What each case shares is the feature Ries insisted upon: something learned or built in the first phase survived into the second. For YouTube, the upload infrastructure. For PayPal, the peer-to-peer transfer logic. For Slack, the channel-and-thread architecture. The noun arrived in startup vocabulary well after the verb had already shaped the industry.