on loan adjective 1adverb 1on-loan noun 1on-loan verb 1forms 3 adjective1 •Loaned or lent, not owned.An ex-L.S.W.R. 0-6-0 goods engine, No. 0395, and a "Terrier" tank-engine, No. 2678, are now on loan. — 1947 adverb1 •Loaned or lent.She worked on loan from another agency. on-loan noun1 •A loan that is made from something that was borrowed; something that is onloaned.Providing "on-loan" personnel is a common practice in the federal government. The parent organization pays the salary and benefits, but the on-loan personnel work in a host agency. — 2007 on-loan verb1 •To onlend; formson-loaned · on-loaning · on-loans