King James Dictionary 
SA'CRED, a. L. sacer, sacred, holy, cursed, damnable. We here see the connection between sacredness and secrecy. The sense is removed or separated from that which is common, vulgar, polluted, or open, public and accursed is separated from society or the privileges of citizens, rejected, banished.
1. Holy pertaining to God or to his worship separated from common secular uses and consecrated to God and his service as a sacred place a sacred day a sacred feast sacred service sacred orders. 2. Proceeding from God and containing religious precepts as the sacred books of the Old and New Testament. 3. Narrating or writing facts respecting God and holy things as a sacred historian. 4. Relating to religion or the worship of God used for religious purposes as sacred songs sacred music sacred history. 5. Consecrated dedicated devoted with to.
A temple sacred to the queen of love.
6. Entitled to reverence venerable.
Poet and saint to thee alone were given, the two most sacred names of earth and heav'n.
7. Inviolable, as if appropriated to a superior being as sacred honor or promise.
Secrets of marriage still are sacred held.
Sacred majesty. In this title, sacred has no definite meaning, or it is blasphemy.
Sacred place, in the law, is that where a deceased person is buried.
Vine's Expository Dictionary of NT Words 
denotes "consecrated to God," e.g., the Scriptures, 2—Timothy 3:15 , RV, "sacred" (AV "holy"); it is used as a noun in the neuter plural in 1—Corinthians 9:13 , RV, "sacred things" (AV, "holy things"). The neuter singular, hieron, denotes "a temple." See Temple. For a comparison of this and synonymous terms see Holy , B, No. 1 (b) and Note (2).
Webster's Dictionary 
(1): ( a.) Hence, not to be profaned or violated; inviolable.
(2): ( a.) Consecrated; dedicated; devoted; - with to.
(3): ( a.) Solemnly devoted, in a bad sense, as to evil, vengeance, curse, or the like; accursed; baleful.
(4): ( a.) Set apart by solemn religious ceremony; especially, in a good sense, made holy; set apart to religious use; consecrated; not profane or common; as, a sacred place; a sacred day; sacred service.
(5): ( a.) Designated or exalted by a divine sanction; possessing the highest title to obedience, honor, reverence, or veneration; entitled to extreme reverence; venerable.
(6): ( a.) Relating to religion, or to the services of religion; not secular; religious; as, sacred history.