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English word trial comes from Latin tres, Latin -alis
tres (Latin)
-alis (Latin)
Used to form adjectives of relationship from nouns or numerals.
trialis (Latin)
trial (English)
(grammar) Pertaining to a language form referring to three of something, like people; contrast singular, dual and plural. (See Ambai language for an example.). Characterized by having three (usually equivalent) components.. Triple.