-th

• -t

• IPA^(key): /-θ/

From Middle English -the, -th, -te, -t (abstract nominal suffix), from Old English -þ, -t, -þu, -tu, -þo, -to (“-th”, abstract nominal suffix), from Proto-Germanic *-iþō, from Proto-Indo-European *-iteh₂. Cognate with Scots -th, West Frisian -te, Dutch -te, Danish -de, Swedish -d, Icelandic -ð, -d, Gothic -𐌹𐌸𐌰 (-iþa), Latin -itās (“-ty, -ity”). See -ity, -t.

-th

1. (no longer productive) Used to form nouns from verbs of action.

   berth, birth, blowth, drawth, flowth, growth, sight, spilth, stealth, theft, weight

2. (now rare and humorous) Used to form nouns from adjectives.

   breadth, chillth, coolth, dampth, dearth, depth, filth, health, height/heighth, illth, length, roomth, ruth, strength, troth, truth, sloth/slowth, warmth, wealth, width, wrath, wrength, youth/youngth

• -ness
• -hood
• -ship
• -itas
• -itude
• -ia
• -itia
• -ity
• -ability
• -ibility
• -icity
• -osity
• -ous
• -ose
• -cy

From Middle English -the, -th, -te, -t (ordinal suffix), from Old English -þa, -þe, -oþa, -oþe, derived from a Proto-Indo-European superlative suffix. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

-th

1. Used to form the ordinal numeral when the final term of the spelled number is not “first”, “second”, or “third”.

   the 4th/Fourth of July

2. (mathematics) Used to form a term denoting the ordinal numeral corresponding to the value, being a natural number, of a mathematical expression.

   The nth term of a geometrical progression whose first term is a and common ratio is r is given by arⁿ.

• See -eth
• When suffixing a spelled number ending on "eight", its final "t" is dropped: eighth; twenty-eighth.
• In older texts, this suffix, and the other suffixes for forming ordinals, may be seen written as superscripts: 1^st, 2^nd, 3^rd, 4^th, 5^th. This is considered old-fashioned; the current preference is to write (when not spelling the numbers), 1st, 2nd, 3rd, 4th, 5th.
• When used to suffix a mathematical expression, a hyphen is sometimes inserted: n-th term.

• -nd
• -rd
• -st

From Middle English -eth, -th, from Old English -eþ, -aþ, -þ.

-th

1. (archaic) A variant of -eth, used to form the archaic third-person singular indicative present tense of verbs.

   come → cometh

   have → hath

   do → doth

   say → saith

• HT, h/t, ht

from Proto-Albanian *-ts from Proto-Indo-European *-k'-.

-th m (-th m)

1. used to form diminutive suffix.

Originally two distinct suffixes:

• Old English -þ, from Proto-West Germanic *-þu, from Proto-Germanic *-þuz, from Proto-Indo-European *-tus.
• Old English -þ, from Proto-West Germanic *-þi, from Proto-Germanic *-þiz, from Proto-Indo-European *-tis.

• -d, -þ, -þe
• -t, -te (following fricatives)

• IPA^(key): /-θ/, /-d/, /-t/

-th

1. (non-productive) Forms abstract nouns denoting a state or attribute, usually from adjectives but occasionally from verbs; -th, -ness

• English: -th, -t (conflated with -the < *-iþō)
• Scots: -th, -t (conflated with -the < *-iþō)

• “-th(e, suf.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007.

-th

1. Alternative form of -the (abstract nominal suffix)

-th

1. Alternative form of -the (ordinal suffix)

-th

1. forms instrumentals

• Nora Deering; Helga H. Delisle (1976) Mohawk: A teaching grammar (preliminary version), Quebec: Manitou College, pages 417