Aleatory, adhesion, unilateral, conditional: insurance contract terms

A life insurance policy is aleatory (the values exchanged can be very unequal and depend on chance), a contract of adhesion (the insurer writes it and the applicant accepts or declines), unilateral (only the insurer makes an enforceable promise) and conditional (the insurer pays only if the policy's conditions are met).

Updated November 4, 2026 · every fact below links to its source

Key facts for the exam

  • Aleatory: the amounts exchanged may be very unequal. One premium may produce the full face amount, or the owner may pay for decades.Source: NAIC Life Insurance Buyer's Guide — The policy as a contract: aleatory nature of insurance
  • Adhesion: one party drafts the contract and offers it without negotiation.Source: PSI — New York DFS Insurance Candidate Information Bulletin — Outline, contract of adhesion
  • Because the insurer drafts the policy, courts resolve genuine ambiguities in favor of the insured.Source: Texas Supreme Court (RSUI v Lynd) — Opinion page 6
  • Unilateral: only the insurer makes an enforceable promise. The owner is not compelled to keep paying premiums, though nonpayment can cause the policy to lapse.Source: South Carolina Department of Insurance — Prelicensing Education Topic Outline — Life, Accident and Health Topic Outline page 12, Unique Features of Insurance Contract > Unilateral
  • Conditional: the insurer's duty to pay depends on a covered event and on the policy's conditions being met, such as proof of loss.Source: SC DOI Prelicensing Outline — Topic Outline pages 12-13
  • Example: if coverage starts only on delivery, acceptance and payment of the first premium, the insurer is not liable while that premium is unpaid.Source: Interstate Insurance Product Regulation Commission — Individual Life Insurance Application Standards — § 3.K. Agreements (1)(d)
The trap. Exam options swap the definitions. Unequal values = aleatory. Take it or leave it = adhesion. One promise = unilateral. Pays only if conditions are met = conditional.

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