Is a deferred compensation plan is a "retirement plan," to answer a Turbo Tax question asking if I was covered by a retirement plan?

Yes, a deferred compensation plan is another name for a 457(b) retirement plan. 

• If you are a W-2 employee, your W-2, Box 13, Retirement Plan should be checked. 

For additional information, please see IRC 457(b) Deferred Compensation Plans

Answer based on the Retirement Plan checkbox on your W-2.

if you don't get a W-2, the answer is NO.

@CarloPoli 

Got it.  Yes, Box 13 was checked as a retirement plan.  Thanks.

Thank you.  The box was checked.