Then in this case bulk, is the correct word, however as most machines have a solitary input slot, and a solitary output slot, they only will process one item at a time. When most people talk about bulk processing, they just want x number of ores processed in y amount of time. normally 1 item per machine and scaled very fast or multiple machines in parallel.
The IC2 induction furnace can process 2 items at once as it has 2 inputs and 2 outputs. As mentioned earlier, the railcraft steam oven also processes mutiple items at once. In both cases, the only process that is bulk is the furnace portion. You normally only have 1 item in and 1 item out. Many of the other machines have secondary outputs or multiple outputs, so being able to mix and match with multiple items in parallel becomes a bit of a hassle.
The IC2 induction furnace can process 2 items at once as it has 2 inputs and 2 outputs. As mentioned earlier, the railcraft steam oven also processes mutiple items at once. In both cases, the only process that is bulk is the furnace portion. You normally only have 1 item in and 1 item out. Many of the other machines have secondary outputs or multiple outputs, so being able to mix and match with multiple items in parallel becomes a bit of a hassle.