1. (noun) something additional of the same kind

• extra

2. (noun) a copy that corresponds to an original exactly

• duplication

3. (verb) make or do or perform again

• double
• reduplicate
• repeat
• replicate

4. (verb) duplicate or match

• parallel
• twin

5. (verb) increase twofold

• double

6. (adjective) being two identical

• matching
• twin
• twinned

1. (noun) something additional of the same kind

• artefact
• artifact

2. (noun) a copy that corresponds to an original exactly

• copy

3. (verb) make or do or perform again

• reproduce

4. (verb) duplicate or match

• agree
• check
• correspond
• fit
• gibe
• jibe
• match
• tally

5. (verb) make a duplicate or duplicates of

• reproduce

6. (verb) increase twofold

• manifold
• multiply

1. (noun) a copy that corresponds to an original exactly

• backup
• computer backup
• counterpart
• similitude
• twin
• match
• mate

2. (verb) make or do or perform again

• copy
• replicate
• geminate
• reduplicate
• recapitulate

3. (verb) increase twofold

• geminate
• redouble

1. (adjective) identically copied from an original

• same

2. (adjective) being two identical

• matched

1. (verb) make or do or perform again

• double
• habitual criminal
• recidivist
• repeater
• insistent
• repetitive
• repeat
• repetition
• repeater
• repeating
• repeating
• repetition
• repetition
• replica
• replication
• reproduction
• replication

2. (verb) duplicate or match

• counterpart
• similitude
• twin

3. (verb) make a duplicate or duplicates of

• copier
• duplicator
• duplication
• gemination
• duplication
• duplication
• extra

4. (verb) increase twofold

• double
• doubling
• double
• doubling

1. (verb) increase twofold

• double up
• parlay