平仄

píngzè
level and oblique tones (technical term for Classical Chinese rhythmic poetry)

CEDICT

  1. level and oblique tones (technical term for classical Chinese rhythmic poetry)
  2. tonal patterns in classical Chinese poetry

Wiktionary

平，四声中的平声。仄，四声中的上、去、入三声。平仄指平声和仄声。旧时写作韵文，用字须平仄相互交替，使其合于格律。

重編國語辭典

  1. 古汉语的声调类型
  2. 文言韵文中用字的声调

維基詞典

Entry Composition

1 平 píng
  1. flat
  2. level
  3. equal
  4. to tie (make the same score)
  5. to draw (score)
  6. calm
  7. peaceful
  8. abbr. for 平声 píngshēng
2 仄 zè
  1. to tilt
  2. narrow
  3. uneasy
  4. oblique tones (in Chinese poetry)