47734964_ld___Others___Receptional_Blog__Notes
[Traditional Terminology] Opportunities to See (OTS) [Online Equivalent Terminology] Impressions [Notes] 
The number of times an ad appears on a user’s screen, regardless of quality. We cannot as yet see this as a percentage of a demographic group seeing an advert. We can only see absolute numbers.
Translating Traditional Marketing Terminology to the Online World - Others | Receptional Blog
Notes