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sub-variation
sub-variation n. 
/ˌsʌbvɛːrɪˈeɪʃ(ə)n/, /ˌsəbˌvɛriˈeɪʃ(ə)n/
Brit. /ˈsʌbvɛːrɪˌeɪʃ(ə)n/
, /ˈsʌbvɛːrɪˌeɪʃ(ə)n//ˌsʌbvɛːrɪˈeɪʃ(ə)n/U.S. /ˈsəbˌvɛriˌeɪʃ(ə)n/
, /ˈsəbˌvɛriˌeɪʃ(ə)n//ˌsəbˌvɛriˈeɪʃ(ə)n/ΚΠ
1810 ‘A. D. Philidor’ Stud. Chess (new ed.) I. 344 In a sub-variation on the white play, No. 2, the bishop to adverse K. rook's 4th.
1914 T. Kinney & M. W. Kinney Dance iv. 64 He goes into sub-variations of ballet steps with the utmost exactness.
2006 P. L. Shillingsburg From Gutenberg to Google x. 193 Ignorance..comes in two major forms with infinite, it seems, sub-variations.
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