"Unexcused absences" refers to when someone is not present at a specific place, like school or work, without having a valid reason or permission for their absence. Full definition
Secondary students with 10 or more unexcused absences in any class during a single advisory shall receive a grade of «FA» in that subject. (dcps.dc.gov)
Three days of unexcused absences results in the virtual school reporting that student as a «truancy case» to the student's local public school district. (ncpolicywatch.com)
Secondary students with four or more unexcused absences from a class per semester now risk failing the class. (educationworld.com)