Double; duplicate; multiplied by two; as, a twofold nature; a twofold sense; a twofold argument.
source: Webster 1913
adverb
by a factor of two
The price increased twofold last year.
source: WordNet 3.0
In a double degree; doubly.
source: Webster 1913
adjective satellite
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. Every episode has its double and treble meaning.
source: WordNet 3.0
twice as great or many
Ate a double portion. The dose is doubled. A twofold increase.
