The Collaborative International Dictionary of English v.0.48:
Signalize \Sig"nal*ize\, v. t. [imp. & p. p. Signalized; p.
pr. & vb. n. Signalizing.] [From Signal, a.]
1. To make signal or eminent; to render distinguished from
what is common; to distinguish.
It is this passion which drives men to all the ways
we see in use of signalizing themselves. --Burke.
2. To communicate with by means of a signal; as, a ship
signalizes its consort.
3. To indicate the existence, presence, or fact of, by a
signal; as, to signalize the arrival of a steamer.