Meanings

money collection

concentration (of light, e.g. with lens or mirror)

group

postman

to meet

meeting

centralization (e.g. power)

accumulation

saturated linework

to gather

agglomerate (e.g. of cells, molecules, etc.)

decentralization

integrated circuit

collection and delivery

to gather

aggregation (of fish)

meeting up

mass psychology

putting together (e.g. opinions)

collected waka poems (of a single poet)