0 used to describe a company or organization that is neither very big nor very small when compared to other companies, etc. of the same type:
Japan's mid-tier brokerages have made significant profits this quarter.
Besides housing a mix of mid-tier and upscale tenants, the outdoor portion of the mall houses several eateries.
The success of their products has seen the company move into the mid-tier market.
Sales of the companys products are generally made directly to retailers, which are primarily mass merchants, mid-tier retailers, juvenile specialty stores, restaurants, internet accounts and wholesale clubs.