hartley Hartleian • Hartleyan · · · Info · Definitions · Characters · · hartley · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) English philosopher who introduced the theory of the association of ideas (1705-1757). Synonyms: Hartley, David Hartley. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079