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1771 Public Advertiser 13 Apr. 2/2 No Visitors of these my [sc. a lion's] Sub-Domains have ever presumed to enter, without first having paid their Respects due to that Rank..which Nature has bestowed upon me.

1872 S. P. Andrews Basic Outl. Universol. iv. 177 It is not the whole of that Domain [sc. Mathematics] which we are about to investigate;—except for the purpose of excluding certain grand Sub-Domains.

1937 A. Smeaton tr. R. Carnap Logical Syntax Lang. 9 The word ‘metalogic’ is a suitable designation for the sub-domain of syntax which deals with logical sentences in the narrower sense.

1941 G. Birkhoff & S. MacLane Surv. Mod. Algebra 47 The domain J can be embedded as a subdomain in a field R, each element of which is a quotient of integers of J.

1975 K. Knorr Power of Nations viii. 209 One can, however, distinguish between the global domain and certain subdomains (e.g., the EEC or the OAS).

1994 .net Dec. 29/2 DNS divides responsibility..by assigning ownership of domains, and then permitting the owner to create as many subdomains as needed.

2009 W. G. Hopkins & N. P. A. Hüner Introd. Plant Physiol. (ed. 4) xxii. 384/1 (caption) This block diagram of two phytochrome molecules (a dimer) shows the principal domains and subdomains.