Definition of happier:
(adj) :
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.
(adj) :
(of people) Experiencing the effect of favourable fortune; favored by fortune or luck; fortunate, lucky.
(adj) :
Content, willing, satisfied (with or to do something); having no objection (to something).
(adj) :
(of acts, events, speech, etc.) Bringing or being an instance of favourable fortune; apt, felicitous, fortunate, propitious.
(v) :
(intransitive, informal) Often followed by up: to become happy; to brighten up, to cheer up.
(v) :
(transitive, informal) Often followed by up: to make happy; to brighten, to cheer, to enliven.