What does applaud mean?
The definition of applaud
Ap*plaud”, v. t.
[imp. & p. p. Applauded; p. pr. & vb. n.Applauding.]
Etym: [L. applaudere; ad + plaudere to clash, to clap the hands: cf. F. applaudir. Cf. Explode.]

1 To show approval of by clapping the hands, acclamation, or other significant sign. I would applaud thee to the very echo, That should applaud again. Shak.
2 To praise by words; to express approbation of; to commend; to approve. By the gods, I do applaud his courage. Shak.

Synonyms
— To praise; extol; commend; cry up; magnify; approve. See Praise.

Ap*plaud”, v. i.
To express approbation loudly or significantly.