Probably the closest synonym to the meaning of the suffix -ful is "containing". Although the suffix itself is derived from the word "full", the suffix does not have nearly as strong a connotation of "leaving room for nothing else" as the word "full" does.
A suffix is a part of a word that is added on to the end of the root, or basic portion of the word. For example, the word rest can add the suffix less and become restless. The word beauty can add the suffix ful and become beautiful.
You can add the suffix -ful to meaning: that makes the word "meaninful"-- filled with meaning, something worth remembering. You can also add the suffix -less: that makes "meaningless"-- something that has no meaning or isn't worth worrying about.
A few words ending with the suffix -ation are: affectation, Americanization, calcification, calibration, edification, fixation, fornication, gradation, infestation. lamination, matriculation, and mummification.