/prə'greʃn; prə`ˇrɛʃən/
n
1 [U] ~ (fromsth) (to sth) (process of) moving forward or developing,esp in stages or gradually; progressing 进行, 进展, 进程, 进步（尤指按步骤的或渐次的）
*the team's progression to the first division 该队的晋级为甲级队
* Adolescence is the period of progression from childhood to adulthood. 青春期是由童年到成年的过渡期.
2 [C] sequence or series 连续; 一系列
*a long progression of sunny days 连续的晴天.

n
[singular,U]
a gradual process of change or development
progression of
　the natural progression of the disease
progression through
　his career progression through the organization
progression from/to
　the logical progression from accountant to financial controller
progression towards
　Europe's progression towards economic and monetary union
[C]
a number of things coming one after the other
→arithmetic progression, geometric progression