codirectionaladj.

Brit.

/ˌkəʊdᵻˈrɛkʃn̩(ə)l/,

/ˌkəʊdʌɪˈrɛkʃn̩(ə)l/, U.S.

/ˌkoʊdəˈrɛkʃ(ə)nəl/,

/ˌkoʊˌdaɪˈrɛkʃ(ə)nəl/

Origin: Formed within English, by derivation. Etymons: co- prefix, directional adj.

Etymology: < co- prefix + directional adj.

Mathematics.

Having the same direction.

ΘΚΠ

the world > space > direction > [adjective] > having same direction

codirectional1837

1837 Trans. Royal Irish Acad. 17 350 A ratio between any two effective steps may be said to be positive or contra-positive, according as those two steps are co-directional or contra-directional, that is, according as their directions agree or differ.

1949 Canad. Jrnl. Math. 1 38 Since every integral null vector is codirectional with a primitive integral null vector, the set of all primitive integral null vectors is spatially dense.

2015 J. Weiner in A. R. Dinner Proc. 240 Conf.: Science's Great Challenges ii. 238 The result is that pseudospin and momentum are codirectional for electrons and antidirectional for holes.

This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022).

单词	codirectional
释义	codirectionaladj. Brit. /ˌkəʊdᵻˈrɛkʃn̩(ə)l/, /ˌkəʊdʌɪˈrɛkʃn̩(ə)l/, U.S. /ˌkoʊdəˈrɛkʃ(ə)nəl/, /ˌkoʊˌdaɪˈrɛkʃ(ə)nəl/ Origin: Formed within English, by derivation. Etymons: co- prefix, directional adj. Etymology: < co- prefix + directional adj. Mathematics. Having the same direction. ΘΚΠ the world > space > direction > [adjective] > having same direction codirectional1837 1837 Trans. Royal Irish Acad. 17 350 A ratio between any two effective steps may be said to be positive or contra-positive, according as those two steps are co-directional or contra-directional, that is, according as their directions agree or differ. 1949 Canad. Jrnl. Math. 1 38 Since every integral null vector is codirectional with a primitive integral null vector, the set of all primitive integral null vectors is spatially dense. 2015 J. Weiner in A. R. Dinner Proc. 240 Conf.: Science's Great Challenges ii. 238 The result is that pseudospin and momentum are codirectional for electrons and antidirectional for holes. This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022). < adj.1837
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