(informal, rare) A happy event, thing, person, etc.
(intransitive, informal) Often followed by up: to become happy; to brighten up, to cheer up.
(transitive, informal) Often followed by up: to make happy; to brighten, to cheer, to enliven.
Having a feeling arising from a consciousness of well-being or of enjoyment; enjoying good of any kind, such as comfort, peace, or tranquillity; blissful, contented, joyous.
Experiencing the effect of favourable fortune; favored by fortune or luck; fortunate, lucky, propitious.
Content, willing, satisfied (with or to do something); having no objection (to something).
(Of acts, speech, etc.) Appropriate, apt, felicitous.
(in combination) Favoring or inclined to use.
(rare, of people, often followed by "at" or "in") Dexterous, ready, skilful.
Implying 'May you have a happy ~' or similar; used in phrases to wish someone happiness or good fortune at the time of a festival, celebration, or other event or activity.