pipelinepipe·line /ˈpaɪp-laɪn/ noun [countableC]1TRANSPORTa line of connecting pipes, often under the ground or sea, used for taking gas, oil etc over long distancesa plan to build a 250-kilometer pipeline to supply the city with water
2be in the pipeline if a plan, idea, or event is in the pipeline, it is still being prepared, but it will happen or be completed soonThe company has other distribution deals in the pipeline which will be announced over the next few weeks.