fourfold
1. [ adjective ] four times as great or many
Synonyms: quadruple
Examples:

"a fourfold increase in the dosage"

Related terms: multiple
2. [ adjective ] having four units or components
Synonyms: quadruplex quadruplicate quadruple
Examples:

"quadruple rhythm has four beats per measure" "quadruplex wire"

Related terms: multiple
3. [ adverb ] by a factor of four
Synonyms: four_times
Examples:

"the price of gasoline has increased fourfold over the past two years"

Related terms: quadruple quadruple
4. [ adjective ] having four units or components
Synonyms: quadruplicate quadruple
Examples:

"quadruple rhythm has four beats per measure"

Related terms: multiple
Similar spelling:   four_flush