oblig·a·to·ry 
/əˈblɪgəˌtori, Brit əˈblɪgətri/ adjective
/əˈblɪgəˌtori, Brit əˈblɪgətri/ adjective 1 formal : required by a law or rule
▪ obligatory [=mandatory] military service ▪ The training is obligatory for all personnel. 2 always used before a noun, humorous : always or often included as a familiar and expected part of something
▪ This action movie includes the obligatory chase scenes.
▪ obligatory [=mandatory] military service ▪ The training is obligatory for all personnel.
▪ This action movie includes the obligatory chase scenes.
