The crossword solutions for the term YEAR IN TRAJAN'S REIGN are ANNO (4 letters), CII (3 letters), CVI (3 letters), CXI (3 letters), CIII (4 letters), and CVII (4 letters). These solutions refer to the years of Trajan's reign as Roman Emperor, which lasted from 98 AD to 117 AD. ANNO translates to 'year' in Latin, while CII, CVI, CXI, CIII, and CVII correspond to the Roman numerals 102, 106, 111, 103, and 107 respectively.