DirectX 11 (or DX11) is a set of drivers distributed by Microsoft that offer improved visual and audio performance. Its main function, and the one for which it is best known, is allow you to run games with excellent state of the art graphics in video games.
A reprimand is a severe, formal or official reproof. Reprimanding takes in different forms in different legal systems. A reprimand may be a formal legal action issued by a government agency or professional governing board (e.g. medical board, bar council). It may also be an administrative warning issued by an employer or school.
Re: Written Reprimand for Attendance. This is an official written reprimand for your failure to perform the required functions of your position by attending work on time and as scheduled. You have arrived over fifteen minutes late for work on four occasions in the past two weeks.