Register \Reg"is*ter\ (r[e^]j"[i^]s*t[~e]r), v. t. [imp. & p. p. Registered (-t[~e]rd); p. pr. & vb. n. Registering.]

[Cf. F. regisrer, exregistrer, LL. registrare. See Register, n.]

1. To enter in a register; to record formally and distinctly, as for future use or service.

2. To enroll; to enter in a list.

Such follow him as shall be registered. --Milton.

Registered letter, a letter, the address of which is, on payment of a special fee, registered in the post office and the transmission and delivery of which are attended to with particular care.

Source: Webster's Revised Unabridged Dictionary (1913)