Etymology
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supplicant (adj.)
1590s, from Latin supplicantem (nominative supplicans), present participle of supplicare "plead humbly" (see supplication). As a noun from 1590s, "a humble petitioner."
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petitioner (n.)

early 15c., peticioner, "presenter of a formal petition, a supplicant for a favor," from petition (n.).

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