Websters says
Main Entry: 1ma·ture
Pronunciation: m&-'tur, -'tyur also -'chur
Function: adjective
Inflected Form(s): ma·tur·er; -est
Etymology: Middle English, from Latin maturus ripe; akin to Latin mane in the morning, manus good
Date: 15th century
1 : based on slow careful consideration <a mature judgment>
2 a (1) : having completed natural growth and development : RIPE (2) : having undergone maturation b : having attained a final or desired state <mature wine> c : having achieved a low but stable growth rate <paper is a mature industry>
3 a : of or relating to a condition of full development b : characteristic of or suitable to a mature individual <mature outlook>
4 : due for payment <a mature loan>
5 : belonging to the middle portion of a cycle of erosion
- ma·ture·ly adverb

Main Entry: 2mature
Function: verb
Inflected Form(s): ma·tured; ma·tur·ing
Date: 15th century
transitive senses : to bring to maturity or completion
intransitive senses
1 : to become fully developed or ripe
2 : to become due

also

Entry Word: mature
Function: adjective
Text: 1 having attained the normal peak of natural growth and development <mature plants ready to bear fruit>
Synonyms adult, full-blown, full-fledged, full-grown, grown, grown-up, matured, ripe, ripened
Related Word developed, ready
Idioms of age
Contrasted Words childish, childlike; boyish, green, juvenile, maiden, puerile, youthful
Antonyms immature
2
Synonyms DUE 2, payable
3
Synonyms UNPAID 2, due, outstanding, overdue, owing, payable, unsettled

I think the key thinking on maturity here at TG is to act and react in a mature adult manner instead of an imature childish manner. Patience is part of maturity. Maturity does not necessarily mean age in this environment but in actions. How you react with your fellow teammates. do you work with a team? do you listen to and follow orders? Or do you run off at first spawn and get yourself or your teammates killed. Most games in most servers are nothing but a fragfest. everyone's running around killing anything that moves. Half the time it's their own teammates. There is no order, only chaos and you very quickly lose the fun in the game. Being mature means understanding that at TG we play differently and respecting that if someone's going to play here they need to leave the fragfest on the other server.