| first | (adjective) preceding all others in time or space or degree | Synonyms: 1st |
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| (adjective) highest in pitch or chief among parts or voices or instruments or orchestra sections | - |
| (adjective) ranking above all others | Synonyms: foremost, world-class |
| (adjective) serving to begin | Synonyms: beginning |
| (adjective) serving to set in motion | Synonyms: inaugural, initiative, initiatory, maiden |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| firsthand | (adjective) received directly from a source | - |
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