-th

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-th1 suffix denoting action or process, formed on vb.-stems (1) in words such as bath, birth, death, of Gmc. age, (2) in others of later emergence, as growth, spilth; (3) in OE. words of quality or condition, in -ðu, -ðo (:- Gmc. -iþō), based on adjs., as breadth, filth, health, mirth, truth.