This is just a quick tip for you today. If you are like me your English may not be the best. Mac OS X Leopard has an excellent built in Dictionary application. This post is going to show you how you can access Dictionary without having to open the program.
If you select any word (select-ability depends on the application) and press Control + Command + D you will see a small dictionary window pop up underneath the word.
Pressing “Dictionary” on the left hand side can change it between Dictionary, Thesaurus and Apple. Clicking on the more button will take you to the Dictionary program itself.
From what I have gathered you can only use this function in Apple applications that have a writing screen. For example TextEdit, Mail etc. It varies between applications.