"participating" in the verb sense
1. participate, take part
share in something
2. enter, participate
become a participant be involved in
"enter a race"
"enter an agreement"
"enter a drug treatment program"
"enter negotiations"
"participating" in the adjective sense
1. active, participating
taking part in an activity
"an active member of the club"
"he was politically active"
"the participating organizations"
Source: WordNet® (An amazing lexical database of English)
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