A conventional weapon is a weapon that does not incorporate chemical, biological or nuclear payloads. The phrase is a neologism, invented to describe the arsenal that existed before the other categories of weapons were heavily researched in the 20th century.
Example Usage of Conventional
gakiq: @labsji the duo has a facebook page too - Q: How do they think the social media has created more exposure to them than Conventional ways?
graphyus: Learning to See Creatively: Almost everyone can see in the Conventional sense, but developing photographic visi.. http://bit.ly/5EK7sC
GeorgiaDemocrat: @pwire Conventional wisdom typically is.