The ordinal form of twelve; coming after the eleventh in sequence.
From Old English twelfta, from twelve + -th suffix. Related to Old High German zweliftö and Gothic twaliftaihun. The 'f' sound developed from the interaction between 'lv' and the 'th' suffix, creating the challenging consonant cluster.
English speakers often struggle with 'twelfth' because it contains one of the language's most difficult consonant clusters: /lfθ/. Many languages would simplify this, but English preserved the historical layers, making it a pronunciation nightmare that even native speakers sometimes avoid by saying 'twelve-th.'
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