I .
/ ˌriːˈdʒɔɪn; NAmE / verb
to join sb/sth again after leaving them :
[ vn ]
to rejoin a club
She turned off her phone and rejoined them at the table.
The path goes through a wood before rejoining the main road.
[also v ]
II .
/ rɪˈdʒɔɪn; NAmE / verb
( formal ) to say sth as an answer, especially sth quick, critical or amusing
SYN retort :
[ v speech ]
'You're wrong!' she rejoined.
[also v that ]
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WORD ORIGIN
II . late Middle English (in the sense reply to a charge in a lawsuit ): from Old French rejoindre , from re- again + joindre to join.