| PLAIN | an inhabitant of a plains region (especially the Great Plains of North America) |
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| PLAIN | a liturgical chant of the Roman Catholic Church |
| PLAIN | characterized by disconcerting directness in manner or speech |
| PLAIN | using simple and direct language |
| PLAIN | a cry of sorrow and grief |
| PLAIN | a written statement of the grounds of complaint made to court law asking for the grievance to be redressed |
| PLAIN | a person who brings an action in a court of law |
| PLAIN | the party who appeals a decision of a lower court |
| PLAIN | expressing sorrow |
| PLAIN | in a plaintive manner |
| PLAIN | expressing sorrowfulness |