Three-fold in a sentence as an adjective

This has a three-fold benefit: it cuts down on the amount of e-mail I receive over the course of the semester because students realize I won't answer frivolous e-mails twelve hours after they're sent. If I have follow-up questions, or the student does, those questions are easier to ask face-to-face.

When you search google for a small phrase, for example, oauth authorization: search query: oauth authorization About 525,000 results search query: oauth "authorization" About 1,470,000 results How does the result not only increase, but increase nearly three-fold? I've always thought the quotes were meant to be more exact.

Three-fold definitions

adjective

three times as great or many; "a claim for treble (or triple) damages"; "a threefold increase"

See also: treble threefold triple

adjective

having more than one decidedly dissimilar aspects or qualities; "a double (or dual) role for an actor"; "the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson; "every episode has its double and treble meaning"-Frederick Harrison

See also: double dual twofold two-fold treble threefold