You can also enable an autocompletion mode for LATEX commands. When a given threshold of letters (default: 3) is entered, a popup window opens with a list of all matching LATEX commands. You can select one of these commands, or ignore this window and type further letters. The entries of the completion box will always change and match your currently typed word.
Go to → → +Complete to enable or disable this mode or to change the threshold.
Large dictionaries are not useful in autocompletion mode. But, we have seen that a lot of words in a document are typed more than once. So Kile offers a completion for all words from the document that the user has already typed. You can manually invoke this completion, if you press Ctrl+Space. Note that this mode is different from the completion mode for LATEX commands.
If you want to turn this mode on or off, go to → → → +Auto Completion. In this dialog you can configure if completion mode for document words should be enabled. There is also an additional autocompletion mode, where a completion box pops up, when a certain threshold is reached.