The more common usage is 2a/b, as you point out. I believe "success" is specifically derived from this meaning of "succeed", not 1a. Typically, securing a posit

The more common usage is 2a/b, as you point out. I believe "success" is specifically derived from this meaning of "succeed", not 1a. Typically, securing a position in a company is still in the sense of definition 2a/b. As far as I know, the definition 1a is unrelated and specifically meant to describe sequence relations, usually for positions of power. For example, "Trump succeeded Obama as president" means Trump became president after Obama. Related words are "succession" (e.g., "succession of the throne" refers to the process of transferring power in a monarchy), "successor" (e.g., the successor function in mathematics takes an integer n and returns n+1), and "precede" (the antonym of "succeed").