Online Dictionaries for Latin Translation
Better and faster than looking up words at the back of the book are the following online aids.
This online dictionary will find the dictionary entry of almost every form you find in your reading, even verb forms.
Online Parsing Tool at the Perseus Project
This tool will tell you the key grammatical information for most words.
This tool will also tell you the key grammatical information for most words.
This works alright as a word to word dictionary, but does not work well for translating sentences.
Here you can access the online dictionaries for each Unit of the Cambridge Series: