Breakdown of Он пошёл на собрание в качестве заместителя.
он
he / it (for a masculine noun) / it (for a neuter noun)
в
in / to (direction)
на
on, at / by (transport) / to (a place) / to (in answer to)
пойти
to go (perfective, on foot) / to start (of rain, snow)
собрание
meeting (assembly, formal gathering)
в качестве
as / in the capacity of
заместитель
deputy
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