Reduplication

Tengthah-suu (重疊辭 reduplication)

koaan, koankoaan, koaarn'koankoaan

Duples

You can repeat monosyllable A to get A'A, for some emphasis.

• koankoaan (high)
• ang'aang (red)
• khuikhuy ((adj) opened. cf. khuy`khuy, meaning "to open")
• khiuxkhiu (QQ; chewy)
• lau-khokkhog, etc (Online Abbreviations)

Triplication

You can repeat a syllable A three times (A"A'A) to mean extremely A. Generally, the first syllable undergoes tone change to the rare rising tone (#6; see Tones of Taiwanese).

• aarng'ang'aang
• jiirn'jinjiin (仁仁仁 very full)
• koaarn'koankoaan
• loaan'loaxnloan
• kaao'kauxkau (厚厚厚; thick)
• zeerng'zexngzeng (靜靜靜; quiet)
• kiirm'kimkym (kym; 金金金; extremely golden)
• khuiie'khuikhuy (開開開; wide open)
• thoor'thothoo ( ; to fail/lose completely)
• kaao'kaokaux (夠夠夠; very sufficient, see kaokaux)
• siirn'sirnsixn (?; ?)
• kof'kofkor (古古古; ancient)
• leerng'lefnglerng (冷冷冷; extremely cool)
• seek'segsek (熟熟熟; very acquainted)
• took'togtok (獨獨獨; very alone)
• siaap'siapsiab (澀澀澀; very astringent)
• siip'sipsib (溼溼溼; very moist. cf. sipsib, sib)

Zhamkhør

• http://www.edutech.org.tw/Composition.htm
• niaxnia (is this reduplication?)