Definition of two-tailed in English:

two-tailed

Syllabification: two-tailed
Pronunciation: /ˌto͞oˈtāld/

adjective

Statistics
(Of a test) testing for deviation from the null hypothesis in both directions.
More example sentences
  • All tests were two-tailed, and statistical significance was considered for p [is less than] 0.05.
  • All statistical significance tests were two-tailed and performed at the 5% level.
  • All tests are two-tailed, and statistical significance is considered at P < 0.05.

Definition of two-tailed in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal