Hawker's Poor Man's Concordance And Dictionary 
The word certain, when applied to man, hath a very special and particular meaning. It is not unlike, for importance, the phrase of a man of God, to distinguish from a man of the world; or the natural man, to distinguish from the spiritual and the inward man of the heart, to denote somewhat from that which is merely outward. So, in like manner, when in Scripture, at any time, it is said, a certain man, there is somewhat striking affixed to the expression; such as in that instance, when It is said, a certain man drew a bow at a venture, and smote the king, ( 1 Kings 22:34) the meaning is the arrow was directed by the Lord. So again, when it is said in the gospel, a certain man had two sons, ( Luke 15:11) a Certain man had a fig tree planted in his vineyard, ( Luke 13:6) a certain man made a great supper, and bade many, ( Luke 14:6) all these, and the like, directly refer to the Lord. So again, when it is said, (as in Ruth 1:1-22) a certain man of Bethlehem-judah went to sojourn in the country of Moab. And again, in the gospel, ( Luke 10:30) a certain man went down from Jerusalem to Jericho, and fell among thieves. Both these cases, as well as others of a similar kind, are designed to represent our nature universally. All men, from our first father, have left Bethlehem-judah, the land of bread, for so the name means; and Jerusalem, the holy city; and by going down to the Moabs and the Jerichos of the world, have fallen among thieves, and been left more than half dead by the great enemy of souls.
King James Dictionary 
1. Sure true undoubted unquestionable that cannot be denied existing in fact and truth.
The dream is certain and the interpretation sure. Daniel 2 .
2. Assured in mind having no doubts followed by of, before a noun.
However I with thee have fixed my lot,
Certain to undergo like doom of death,
Consort with thee.
To make her certain of the sad event.
3. Unfailing always producing the intended effect as, we may have a certain remedy for a disease. 4. Not doubtful or casual really existing.
Virtue that directs our ways
Through certain dangers to uncertain praise.
5. Stated fixed determinate regular.
Ye shall gather a certain rate every day. Exodus 16 .
There came a certain poor widow. Mark 12 .
In the plural number, a particular part or number some an indefinite part, number, or quantity. Hanani came, he and certain men of Judah. I mourned certain days. Nehemiah 1 . 2 . 6 .
In the latter sense, it is used as a noun as, certain also of your own poets have said. Acts 17 .
Webster's Dictionary 
(1): (n.) A certain number or quantity.
(2): (a.) Not to be doubted or denied; established as a fact.
(3): (a.) Assured in mind; having no doubts; free from suspicions concerning.
(4): (a.) Determined; resolved; - used with an infinitive.
(5): (adv.) Certainly.
(6): (a.) Fixed or stated; regular; determinate.
(7): (n.) Certainty.
(8): (a.) Not specifically named; indeterminate; indefinite; one or some; - sometimes used independenty as a noun, and meaning certain persons.
(9): (a.) Actually existing; sure to happen; inevitable.
(10): (a.) Unfailing; infallible.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
in ecclesiastical technology, is a lesser endowment for a mortuary mass, where the person was prayed for with a number of others, and not individually; the names being written all together on a board or plate above the altar.