Adjectives attached to concepts add necessary dimensions conjoined by AND.

Evidence

The classic hyphenated concept from philosophy and logic means semantically that we are adding a new necessary dimension to the existing ones. For example, “presidential” when modifying democracy adds a new attribute to those already existing for democracy. Hence the structural principle uses AND to conjoin the attribute presidential to the concept democracy. The basic principle is that “all noun modifiers are to be treated via conjunction” (Lakoff 1987, 14). — Gary Goertz, Social Science Concepts and Measurement, 1458

Categorization

• XREF: Connects to the book’s earlier treatment of necessary conditions and Sartorian concept structure.
• SHARE: Lakoff’s line that all noun modifiers are conjunctions is the kind of tidbit for a linguist or formal-semantics friend.