To lay on; bring into physical proximity or contact: as, to apply the hand to the breast; to apply medicaments to a diseased part of the body; to apply a match to powder.To bring into contact with particulars or with a particular case, as a principle, law, or rule; bring to bear upon; put into practical operation.To use or employ for a particular case, or devote to a particular purpose: as, to apply a sum of money to the payment of a debt.To connect or associate with, or refer to, some person or thing as applicable or pertinent; use as suitable or relative to some person or thing: as, to apply the testimony to the case.. To attribute; refer; ascribe.To give with earnestness or assiduity; employ with attention; devote: as, “apply thine heart unto instruction,” Prov. xxiii. 12.. To address or direct.. To be busy about; devote one's self with diligent vigor to; ply (which see).. To bend (the mind); reflexively, to comply; conform; be subservient to.. To visit.Synonyms To place (on). To appropriate (to). To turn, bend, direct. Addict, Devote, Apply. See addict.. To be in close contiguity.To have application; be applicable; have some connection, agreement, analogy, or reference: as, this argument applies well to the case; the remarks were not meant to apply to you.To make application or request; ask; have recourse with a view to gain something: as, to apply for an office, information, etc.To give attention; turn the mind.In astrology, of a heavenly body, to approach to the conjunction or aspect of another.