def METHOD_NAME(col_name, col_definitions):
    """Transform a column name to its standardized form.
    Arguments
    ---------
    col_name: str
        Name of the column in the dataframe.
    col_definitions: dict
        Dictionary of {standardized_name: [list of possible names]}.
        Ex. {"title": ["title", "primary_title"],
            "authors": ["authors", "author names", "first_authors"]}
    Returns
    -------
    str:
        The standardized name. If it wasn't found, return None.
    """
    for name, definition in col_definitions.items():
        if col_name.lower() in definition:
            return name
    return None