alkenes

https://doi.org/10.1351/goldbook.A00224
Acyclic branched or unbranched hydrocarbons having one carbon–carbon double bond and the general formula $\ce{C_{n}H_{2n}}$. Acyclic branched or unbranched hydrocarbons having more than one double bond are alkadienes, alkatrienes, etc.
See also: olefins
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1313 [Terms] [Paper]