something (a person or object or scene) selected by an artist or photographer for graphic representation | the interdisciplinary study of systems in general, with the goal of elucidating principles that can be applied to all types of systems at all nesting levels in all fields of research. |
a branch of knowledge | |
some situation or event that is thought about | |
the subject matter of a conversation or discussion | |
(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated | |
(logic) the first term of a proposition | |
a person who owes allegiance to that nation | |
a person who is subjected to experimental or other observational procedures; someone who is an object of investigation | |