Word: 周岁 (zhōusuì) Traditional: 週歲 周岁 dictionary entry zhōusuì one full year (e.g. on child's first birthday) Full dictionary entry for 周岁 Example sentences using 周岁 2 sentences, showing page 1 of 1. 你儿子满周岁了吗？ Nǐ érzi mǎn zhōusuì le ma? Has your son turned one yet? 未满十八周岁不能开车。 Wèi mǎn shíbā zhōusuì bùnéng kāichē. You can't drive if you are under eighteen.