A humorous remark or story intended to amuse; can also refer to something said in jest rather than seriously.
His jokes always make me laugh.
冗談はさておき、本題に入ろう。
Joking aside, let's get down to business.
He always makes jokes and makes everyone laugh.
She took my joke seriously and got angry.
I said it as a joke, but they took it seriously.
You must be joking—I never heard about anything like that.
The teacher gave the lesson while mixing in a few jokes.
冗談 is a general word for a joke of any kind, while 駄洒落 refers narrowly to a lame pun based on wordplay.
half-joking; somewhat joking; in a jocular vein