| fourfold | (adv) by a factor of four, Syn. four times, Example: the price of gasoline has increased fourfold over the past two years |
| phi coefficient | (n) an index of the relation between any two sets of scores that can both be represented on ordered binary dimensions (e.g., male-female), Syn. fourfold point correlation, phi correlation |
| quadruple | (adj) having four units or components, Syn. fourfold, four-fold, quadruplex, quadruplicate, Example: quadruple rhythm has four beats per measure; quadruplex wire |
| quadruple | (adj) four times as great or many, Syn. fourfold, four-fold, Example: a fourfold increase in the dosage |
