Single-edged and double-edged swords

One strict definition of a sword restricts it to a straight, double-edged bladed weapon designed for both slashing and thrusting. However, general usage of the term remains inconsistent and it has important cultural overtones, so that commentators almost universally recognize the single-edged swords such as Asian weapons (dāo 刀, katana 刀) as "swords", simply because they have a prestige akin to their European counterparts.

Europeans also frequently refer to their own single-edged weapons as swords — generically backswords, including sabres. Other terms include falchion, scimitar, cutlass, dussack, Messer or mortuary sword. Many of these refer to essentially identical weapons, and the different names may relate to their use in different countries at different times. A machete as a tool resembles such a single-edged sword and serves to cut through thick vegetation, and indeed many of the terms listed above describe weapons that originated as farmers' tools used on the battlefield.