Capable of being gathered or assembled together; able to be collected into a group or congregation.
From Latin 'congregabilis,' derived from 'congregare' (to flock together, gather), combining 'con-' (together) and 'gregare' (to collect into a herd, from 'grex' meaning herd or flock).
The 'greg' part connects to words like 'gregarious' and 'aggregate'—all about herds and groups—so congregable means 'able to be herded together into one group.'
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