nonidealityn.
/ˌnɒnʌɪdɪˈalᵻti/, U.S. /ˈˌnɑnˌaɪdiˈælədi/ The state or condition of being nonideal; an instance of this.
ΚΠ
1932 F. R. Tennant Philos. of Sci. vi. 176 These feelings, etc. cannot..be said to evidence the reality, or the non-ideality, of the objects which excite them.
1951 Philos. Trans. (Royal Soc.) A. 243 170 The non-ideality of solutions of long-chain molecules.
1973 F. G. Shinskey pH & pIon Control in Process & Waste Streams iii. 57 In these regions, nonidealities begin to dominate.
1977 L. Dupré Dubious Heritage iii. 70 The genuine otherness of contingent reality.., expressed in the non-ideality of nature.
1997 Limnol. & Oceanogr. 42 1777/1 The exponential term is a correction for the nonideality of the CO2 in air mixture.
This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1932