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How to sign: increase twofold
"The population doubled within 50 years";
Similiar / Same: duplicate
How to sign: having more than one decidedly dissimilar aspects or qualities; public preaching and private influence"- R.W.Emerson
"a double (or dual) role for an actor"; "the office of a clergyman is twofold; "every episode has its double and treble meaning"-Frederic;
How to sign: consisting of or involving two parts or components usually in pairs
"an egg with a double yolk"; "a double (binary) star"; "double doors"; "dual controls for pilot and copilot"; "duple (or double) time consists of two (or a multiple of two) beats to a me;