-th

alternative -t

1. idiomaticUsed to form nouns from verbs of action.

   bear + -th → birth

   3 more examples

   grow + -th → growth

   heal + -th → health

   steal + -th → stealth

   Synonyms: -ing, -ation

2. now only productive in informal wordsUsed to form nouns of quality from adjectives.

   wide + -th → width

   4 more examples

   warm + -th → warmth

   long + -th → length

   deep + -th → depth

   strong + -th → strength

   Synonyms: -ness, -ity, -cy, -itude

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

   1 more example

   Washington’s first outpost of the California-born burger joint opened Wednesday after long anticipation and a few fake-outs (like the prank sign someone posted in Wallingford in June). Problem is, it’s located in Ridgefield, a suburb of Vancouver, Washington. […] Ridgefield is the 424th location.

   2025 August 21, Allison Williams, “I Braved Washington’s First In-N-Out Burger Line”, in Seattle Met, archived from the original on 28 Aug 2025

   1. mathematicsUsed 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 ar#123;n-1#125;.

2. Used to form the denominator of a fraction.

   one seventh; three tenths

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

   do → doth

   3 more examples

   come → cometh

   have → hath

   say → saith