What is the meaning of جمع?

to gather, assemble, keep together, to collect

to unite, to reconcile

to collect oneself, to recollect

to lie with

to add

to form the plural

to contain

to be full-grown

to have two or more negative attributes at the same time; to have a negative attribute on top of another negative attribute

to assemble

verbal noun of جَمَعَ (jamaʕa) 

gathering, collecting

crowd, throng, mass, legion

a military force

plural, a form of a noun denoting multiples by its sense

addition

lumping together, putting subjects in the same category

a proposition in which a general and a particular subject are included in one category or judgement through a common attribute

distribution of a term

plural

addition

collection

to gather, to collect, to bring together

to add

to gather, to collect, to bring together

to assemble

plural

crowd

addition

plural

Source: wiktionary.org