Java Compress Multiple strings with the same rule

I'm creating an android application that needs a massive database (70mb but the application has to work offline...). The largest table has two columns, a keyword and a definition. The definitions themselves are relatively short, usually under 2000 characters, so compressing each one individually wouldn't save me very much since compression libraries store the rules decompress the strings as part of the compressed string.

However if I could compress all of these strings with the same set of rules and then store just the compressed data in the DB and the rules elsewhere, I could save a lot of space. Does anyone know of a library that will let me do something like this?

Desired behavior:

public String getDefinition(String keyword) {
    DecompressionObject decompresser = new DecompressionObject(RULES_FILE);
    byte[] data = queryDatabase(keyword);
    return decompresser.decompress(keyword);
}