What is a liberal?

Now may be a good time to repeat this quote from our 35th President --

ADDRESS OF JOHN F. KENNEDY UPON ACCEPTING THE LIBERAL PARTY NOMINATION FOR PRESIDENT, NEW YORK, NEW YORK, SEPTEMBER 14, 1960
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"If by 'Liberal' they mean, as they want people to believe, someone who is soft in his policies abroad, who is against local government, and who is unconcerned with the taxpayer's dollar, then the record of this party and its members demonstrate that we are not that kind of 'Liberal.' But, if by a 'Liberal,' they mean someone who looks ahead and not behind, someone who welcomes new ideas without rigid reactions, someone who cares about the welfare of the people - their health, their housing, their schools, their jobs, their civil rights, and their civil liberties - someone who believes that we can break through the stalemate and suspicions that grip us in our policies abroad, if that is what they mean by a 'Liberal,' then I'm proud to say that I'm a ''Liberal'."
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https://www.jfklibrary.org/archives/other-resources/john-f-kennedy-speeches/liberal-party-nomination-nyc-19600914