1. (noun) a lightweight paper used with carbon paper to make multiple copies

• manifold paper

2. (verb) combine or increase by multiplication

• multiply

3. (adjective) many and varied; having many features or forms

• multiplex

1. (noun) a pipe that has several lateral outlets to or from other pipes

• pipage
• pipe
• piping

2. (noun) a lightweight paper used with carbon paper to make multiple copies

• paper

3. (noun) a set of points such as those of a closed surface or an analogue in three or more dimensions

• mathematical space
• topological space

4. (verb) make multiple copies of

• copy
• re-create

5. (verb) combine or increase by multiplication

• increase

1. (noun) a pipe that has several lateral outlets to or from other pipes

• exhaust manifold
• inlet manifold
• intake manifold

2. (verb) combine or increase by multiplication

• double
• duplicate
• proliferate
• quadruple
• quintuple
• treble
• triple

1. (adjective) many and varied; having many features or forms

• multiple

1. (verb) make multiple copies of

• manifold paper

2. (verb) combine or increase by multiplication

• multiplication
• times
• multiplication
• multiplicative