fourfold

About 0.90 uses per million words.

Meaning

1. adjective Four times as great; quadruple.
2. adjective Comprised of four individual members.
3. adverb By a factor of four.
4. verb To increase to four times as much; to multiply by four.
5. noun An algebraic variety of degree 4.
6. noun A fourfold axis of rotational symmetry.

Similar words

quadruple quadruplicate multiple four times four quadripartite quaternary four-way threefold quadrilateral

Often followed by

increase division in classification table or rise and root