Section 5 establishes the window within which a proposal can be revoked — only before acceptance is communicated to the proposer. Once the proposer receives or is deemed to have received the acceptance, the proposal becomes irrevocable. Section 4 deals with when communication is complete (posting/receiving), Section 6 lists the modes of revocation, and Section 7 requires acceptance to be absolute. The interplay of Sections 4 and 5 is critical for understanding postal contract formation.

1. 1 Pick up Indian Contract Act, 1872.
2. 2 Check Section 4 → communication of proposals, acceptances, and revocations. Not the definition itself.
3. 3 Check Section 5 → 'Revocation of proposals and acceptances.' ✓ Reads: 'A proposal may be revoked at any time before the communication of its acceptance is complete as against the proposer.'
4. 4 S.6 = modes of revocation. S.7 = acceptance must be absolute.

The text reads: Section 5: A proposal may be revoked at any time before the communication of its acceptance is complete as against the proposer, but not afterwards.