This is the verse translation, not a definition of the individual word.
As for the first forerunners of the Emigrants[1] and the Helpers[2], and those who followed them in righteous deeds, Allah is pleased with them and they are pleased with Him. He has prepared for them gardens under which rivers flow, abiding therein forever. That is the supreme triumph.
Source
[1] Those who emigrated from Makkah to Madīnah.
[2] The Muslims of Madīnah who helped the Prophet (ﷺ) and other Muslims.