Etymology
Advertisement
therefor (adv.)
"for this, for that," Middle English variant spelling of therefore (q.v.); in modern use perhaps perceived as there + for.
Related entries & more 
Advertisement
therefore (adv.)

Old English þærfore; from there + fore, Old English and Middle English collateral form of for. Since c. 1800, therefor has been used in sense of "for that, by reason of that;" and therefore in sense of "in consequence of that." Similar formation in Dutch daarvoor, German dafür, Danish derfor.

Related entries & more 
irrepressible (adj.)

"not able to be controlled or restrained," 1763, from assimilated form of in- (1) "not, opposite of" + repress (v.) + -ible.

Increase of population, which is filling the States out to their very borders, together with a new and extended network of railroads and other avenues, and an internal commerce which daily becomes more intimate, is rapidly bringing the States into a higher and more perfect social unity or consolidation. Thus, these antagonistic systems are continually coming into closer contact, and collision results.
Shall I tell you what this collision means? They who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefor ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become either entirely a slaveholding nation, or entirely a free-labor nation. [William H. Seward, speech at Rochester, N.Y., Oct. 2, 1858]

Related: Irrepressibly. "Common Sense" (1777) has unrepressible.

Related entries & more