What does assignor mean?
An assignor is the individual or organization that legally transfers rights, property, or obligations to another party, known as the assignee. The term appears most often in formal legal documents — patent filings, lease agreements, mortgage contracts, and intellectual-property transactions — where precision about who is giving and who is receiving matters greatly. For example, when an inventor sells the rights to a patent to a company, the inventor acts as the assignor and the company becomes the assignee. The word carries a distinctly professional, bureaucratic register: it rarely appears in casual conversation but is essential vocabulary in law, finance, and business. Its meaning hinges entirely on direction — the assignor is always the giver in the exchange, never the receiver. Understanding this distinction helps readers navigate contracts and legal texts where the two roles are frequently mentioned side by side, and it makes the term indispensable for anyone dealing with transfers of ownership or legal responsibility.
nounA person or entity that transfers rights, property, or obligations to another party, especially by signing a legal assignment such as a patent, lease, or contract.
- Legal: the party that transfers rights, property, or obligations (as in patents, leases, mortgages, or contracts) to another party (the assignee).
"Under the terms of the agreement, the assignor transferred all patent rights to the licensee for a nominal fee."
"As the assignor of the trademark, the founder retained no further claim once the paperwork was signed."
"The mortgage document clearly identified the assignor as the original borrower seeking to pass on the obligation."
Regular plural formation; used when multiple parties jointly transfer rights.
"Both assignors signed the joint patent application before the rights were conveyed."
Every time an inventor signs over a patent, they go from being the creator to the assignor — the person legally handing their brainchild to someone else's name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of assignor
Assignor derives from the Old French 'assigner' and ultimately from the Latin verb 'assignare', meaning 'to mark out, allot, or appoint', formed from 'ad-' (to) plus 'signare' (to sign or mark). English adopted the related verb 'assign' in the late medieval period, and 'assignor' emerged later as a legal-agent noun denoting the party who performs an assignment. It shares this Latin root with words such as 'sign', 'signature', and 'signal'.
How assignor is actually used
Almost exclusively used in formal legal, commercial, or contractual contexts; rare in everyday speech. Always paired with its counterpart, the assignee.
Easily confused with assignor
The assignor is the party who gives up or transfers the rights, while the assignee is the party who receives them.
A transferee receives a transfer in a general sense, whereas an assignor is specifically the one initiating and giving away the assigned rights.