1pass·ing 
/ˈpæsɪŋ, Brit ˈpɑ:sɪŋ/ noun
/ˈpæsɪŋ, Brit ˈpɑ:sɪŋ/ noun [noncount] 1 : the act of moving toward and beyond something — usually + of ▪ I could hear the passing of a distant train. [=I could hear a distant train passing] 2 — used to talk about the movement of time — usually + of ▪ They celebrate the passing of each season. ▪ She grew stronger with the passing of each year. ▪ We lament the passing of an era. ▪ Only the passing of time will help her deal with this tragedy. 3 formal : a person's death
▪ After her husband's passing, she moved to a smaller house. ▪ We all mourned his passing. 4 : the act of officially approving a bill, law, etc.
▪ the passing [=passage] of the bill through Congress
▪ After her husband's passing, she moved to a smaller house. ▪ We all mourned his passing.
▪ the passing [=passage] of the bill through Congress
in passing
: in a brief way while discussing something else
▪ She mentioned in passing that she was studying law. ▪ The report notes the incident only in passing.
▪ She mentioned in passing that she was studying law. ▪ The report notes the incident only in passing.
