Vine's Expository Dictionary of NT Words 
"to give up or back," is translated "to render," (a) of righteous acts, (1) human, Matthew 21:41; 22:21; Mark 12:17; Luke 16:2 , RV (AV, "give"); Luke 20:25; Romans 13:7; 1—Corinthians 7:3; (2) Divine, Matthew 16:27 , RV, "shall render" (AV, "shall reward"), an important RV change; Romans 2:6; 2—Timothy 4:14 , RV (AV, "reward"); Revelation 18:6 (ditto); 22:12, RV (AV, "give"); (b) of unrighteous acts, Romans 12:17 , RV (AV, "recompense"); 1—Thessalonians 5:15; 1—Peter 3:9 . See Deliver , A, No. 3, Recompense, B No. 2.
"to give in return for," is translated "render" in 1—Thessalonians 3:9 . See Recompense , Repay.
"to furnish, provide, supply," is translated "render" in Colossians 4:1 , RV (AV, "give"), of what is due from masters to servants. See Give , No. 8.
"to give," is translated "rendering" in 2—Thessalonians 1:8 , RV (AV, "taking"), of the Divine execution of vengeance at the revelation of Christ from heaven hereafter. See Give , No. 1.
Webster's Dictionary 
(1): ( v. t.) Hence, to furnish; to contribute.
(2): ( v. t.) To plaster, as a wall of masonry, without the use of lath.
(3): ( n.) One who rends.
(4): ( v. i.) To give an account; to make explanation or confession.
(5): ( v. t.) To cause to be, or to become; as, to render a person more safe or more unsafe; to render a fortress secure.
(6): ( v. t.) To return; to pay back; to restore.
(7): ( v. t.) To inflict, as a retribution; to requite.
(8): ( v. t.) To give up; to yield; to surrender.
(9): ( v. t.) To interpret; to set forth, represent, or exhibit; as, an actor renders his part poorly; a singer renders a passage of music with great effect; a painter renders a scene in a felicitous manner.
(10): ( v. t.) To furnish; to state; to deliver; as, to render an account; to render judgment.
(11): ( n.) A surrender.
(12): ( v. t.) To translate from one language into another; as, to render Latin into English.
(13): ( v. t.) To try out or extract (oil, lard, tallow, etc.) from fatty animal substances; as, to render tallow.
(14): ( n.) An account given; a statement.
(15): ( n.) A return; a payment of rent.
(16): ( v. i.) To pass; to run; - said of the passage of a rope through a block, eyelet, etc.; as, a rope renders well, that is, passes freely; also, to yield or give way.
King James Dictionary 
REND'ER, n. from rend. One that tears by violence.