orientabilityn.
/ˌɔːrɪɛntəˈbɪlᵻti/, /ˌɒrɪɛntəˈbɪlᵻti/, U.S. /ˈˌɔriɛn(t)əˈbɪlᵻdi/ Chiefly Mathematics.
The property of being orientable.
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the world > relative properties > number > geometry > surface > [noun] > property of
orientability1926
1926 Trans. Amer. Math. Soc. 28 12 Orientability is defined for it as for an ordinary manifold.
1956 E. M. Patterson Topol. i. 9 The idea of orientability is derived from the physical idea of two-sidedness.
1972 Nature 13 Oct. 387/1 Within general relativity it is necessary to impose time orientability on the E4 manifold such that the arrows placed on timelike world lines agree in sign.
1999 Polymer Engin. & Sci. (Nexis) 39 2222 A larger δT, reflective of slower crystallization rate..yields lower crystallinity in the copolymer, thereby, improving properties such as orientability.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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