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A dictionary can be made strong enough to avoid additional spaces by using a compression technique called Huffman coding. This technique assigns shorter codes to frequently occurring words and longer codes to less frequent words. This reduces the overall size of the dictionary and eliminates any unnecessary spaces. Furthermore, the dictionary can be optimized for the specific language or application it is being used for, such as removing commonly used but unnecessary words like "a" and "the". This not only saves space, but also improves search and retrieval times. Additionally, implementing strict validation rules and input/output formatting can also help prevent additional spaces from being added or included in the dictionary.