Ana or ANA may refer to:
Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure.
Anarchism is a political philosophy that advocates self-governed societies based on voluntary institutions.
Anabolic steroids, also known more properly as anabolic-androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone as well as synthetic substances that are structurally related and have similar effects to testosterone.
An analgesic or painkiller is any member of the group of drugs used to achieve analgesia, relief from pain.
Anarcho-capitalism is a political philosophy that advocates the elimination of the state in favor of individual sovereignty, private property, and free markets.
In electronics, an analog-to-digital converter (ADC, A/D, A–D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.
Standard anatomical terms of location deal unambiguously with the anatomy of animals, including humans.
Analysis of variance (ANOVA) is a collection of statistical models used to analyze the differences among group means and their associated procedures (such as "variation" among and between groups), developed by statistician and evolutionary biologist Ronald Fisher.
Anaheim (pronounced /ˈænəhaɪm/) is a city in Orange County, California, part of the Los Angeles metropolitan area.