You can probably guess the etymology of containerize quite easily - it was formed around 1956 by adding "-ize" to "container" to create a verb. "Containerize" didn't start out with the meaning "to put in a container," however. It originally meant "to ship by containerization" - that is, to ship using a method in which a large amount of material is packaged into large standardized containers. The more general "pack in containers" sense came somewhat later, but it is now becoming more common. These days, for example, you might containerize a plant or your household clutter.
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