If you're an employee of a company that offers a SEP IRA, your contributions count toward your traditional IRA contribution limit rather than the limit for defined contribution plans. For example, as of 2013, you can contribute up to $6,500 if you're 50 or older, or $5,500 if you're younger than 50.
Definition of skepticism 1: an attitude of doubt or a disposition to incredulity either in general or toward a particular object 2 a: the doctrine that true knowledge or knowledge in a particular area is uncertain
The definition of a proponent is someone who is in favor of something or who advocates for a cause. An example of a proponent is a person lobbying for gun reform. a person who makes a proposal or proposition. a person who espouses or supports a cause, etc.