Well, if you want to find out you can get onto sec.gov and it will give you the current definition.

想了解的话就到SEC.gov去查查吧,你会找到最新的定义

耶鲁公开课 - 金融市场课程节选

Because I know this program was saved by default into my current folder, my current directory, so dot slash means run the program called a.out that's right here in my current directory not in, like, a out my applications folder or somewhere else.

程序默认保存在,当前目录下的文件夹，/意味着运行这个名为“a，out“的文件,是我当前目录下的文件，而不是应用程序文件夹或其他别的地方的。

哈佛公开课 - 计算机科学课程节选