Supposition refers to a hypothetical assumption or provisional idea, often serving as a premise for reasoning without immediate verification. Philosophers and logicians have long grappled with its nature, exploring its role in knowledge and judgment. John Stuart Mill linked supposition to empirical uniformity, arguing that its validity stems from experiential consistency rather than mere conceptual feasibility.
Herbert Wildon Carr introduced the notion of "subsistence" as a middle ground between existence and non-existence, framing assumptions as real possibilities unbound by immediate truth. Bertrand Russell emphasized their role in structuring judgments, while Sir Joshua Reynolds critiqued the flawed assumption of human control over circumstances. These varied perspectives reveal assumption as a bridge between abstract possibility and concrete reality, shaping how thinkers navigate uncertainty and construct arguments.