Able to be combined or gathered together into a group or whole.
From Latin 'aggregare' (to add to a group), combining 'ad-' (to) and 'gregem' (flock/herd). The suffix '-able' means capable of being done.
The Latin root 'grex' (herd) also gives us 'congregation' and 'segregation' — so aggregable literally means 'able to be brought into a herd or group.'
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