n. Taking on a number of different projects or jobs rather than a career within a single company or industry.
2001
Going plural is a trendy way for successful middle-aged directors to downshift. Instead of doing one full-time executive job, pluralists take on several non-exec posts.
1990 (earliest)
Peter Parker's offering falls into none of those categories, but perhaps this is not surprising since he is very much a one-off. 'Going plural' is a phrase I first heard from his lips, some 20 years ago, to describe his intention to seek a portfolio of different interests rather than a single career.
Of the nearly 100 citations that the media databases turn up for this phrase, all but a handful occur in 2000 or later. (This is mostly because a company called Going Plural was created recently.) However, the earliest citation hints that the phrase is quite a bit older.