adjective. brought together into a group or crowd.

verb. Simple past tense and past participle of accumulate.

adjective. periodically accumulated over time

"For some people, who can see no other solution, enduring the routine and boredom of daily "have-to" travel has been made more tolerable by looking forward to long-planned "want-to" trips -- almost as if pain accumulated now can at some point be exchanged for pleasure."

increased  

assembled  collected  congregate  massed  

accumulate