Fun/fʌn/ Definition 1 of 3Pro Tip 1/3Activities Context Use 'fun' for activities that make you smile and laugh, not for serious tasks. Playing board games is always fun. Pro Tip 2/3Quantity Expression 'A lot of fun' means you enjoyed yourself greatly, more than just a little. The amusement park was a lot of fun. Pro Tip 3/3Participatory Tone Invite others using 'join the fun' to suggest inclusiveness and shared enjoyment. Come on, join the fun at the beach!