Homophones
Freq #3067
Meanings
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Thesaurus
Synonyms
Appears in
Simplified etymology
Plain and plane both come from Latin planus, meaning “flat.” In the early 17th century mathematicians introduced the spelling plane to distinguish geometrical uses from senses of plain such as “ordinary” and “simple.”
Etymology
From Middle English pleyn, borrowed from Old French plein, from Latin plēnus (“full, filled, complete”). Ultimately from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Doublet of plene, plenary, and full.
*pleh₁-
Proto-Indo-European
pleyn
Middle English
plein
Old French
plēnus
Latin
*plēnos
Proto-Italic
*pl̥h₁nós
Proto-Indo-European
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