| Main Entry: | dual |
| Part of Speech: | adjective |
| Definition: | two-fold |
| Synonyms: | bifold, binal, binary, coupled, double, doubleheader, duple, duplex, duplicate, matched, paired, twin |
| Main Entry: | duplicate |
| Part of Speech: | adjective |
| Definition: | matching |
| Synonyms: | alike, corresponding, dualistic, duple, duplex, equal, equivalent, identic, identical, indistinguishable, same, self-same, tantamount, twin, twofold, very same |
| Notes: | duplication may be regarded as an activity because one duplicates (makes again) something, but replication is a process in which something is replicated (copied) |
| Antonyms: | different, unmatching |
| Main Entry: | twofold |
| Part of Speech: | adjective |
| Definition: | having more than one and less than three |
| Synonyms: | bifold, binal, binary, diploid, double, dual, duple, duplex, duplicate, paired |