-th

-th

1
a suffix forming nouns of action (birth ) or abstract nouns denoting quality or condition (depth; length; warmth ).

Origin:
Middle English -th(e), Old English -thu, -tho, -th (variant -t after a velar, f, or s); cognate with Gothic -itha, Latin -tus, Greek -tos

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-th

2
a suffix used in the formation of ordinal numbers (fourth, tenth ), in some cases, added to altered stems of the cardinal (fifth; twelfth ).

Origin:
Middle English -the, -te, Old English -tha, -the (variant -ta after f or s); cognate with Old Norse -thi, -di, Latin -tus, Greek -tos; see -eth

-th

3
variant of -eth1: doth.
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World English Dictionary
-eth or -th2
 
suffix forming ordinal numbers
a variant of -th : twentieth
 
-th or -th2
 
suffix forming ordinal numbers

-th1
 
suffix forming nouns
1.  (from verbs) indicating an action or its consequence: growth
2.  (from adjectives) indicating a quality: width
 
[from Old English -thu, -tho]

-th or -eth2
 
suffix
forming ordinal numbers: fourth; thousandth
 
[from Old English -(o)tha, -(o)the]
 
-eth or -eth2
 
suffix
 
[from Old English -(o)tha, -(o)the]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

-th
suffix forming nouns from verbs (depth, strength, truth, etc.), from O.E. -ðu, -ð, from PIE *-ita (cf. Skt. -tati-, Gk. -tet-, L. -tati-). The suffix forming ordinal numbers (fourth, tenth, etc.) is O.E. -ða, from PIE *-tos (cf. Skt. thah, Gk. -tos, L. -tus).
Online Etymology Dictionary, © 2010 Douglas Harper
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