Short answer. Generally, where the contract was executed. Rule 130, Section 11 provides that the language of a writing is interpreted according to the legal meaning it bears in the place of its execution, unless the parties intended otherwise. The place of signing controls the default legal meaning, not the place of litigation.
What the law says
The language of a writing is to be interpreted according to the legal meaning it bears in the place of its execution, unless the parties intended otherwise.
Rule 130, Section 11 — Interpretation of a writing according to its legal meaning. Read the full provision →
The default reference point: place of execution
Section 11 anchors interpretation to a specific location — the place where the writing was executed — rather than to wherever a dispute over the writing happens to be litigated. Legal terms can carry different meanings in different jurisdictions, so the rule needs a fixed reference point, and it chooses the place of signing. Without a fixed reference point like this, parties disputing an instrument's meaning could each argue for whichever jurisdiction's interpretation happened to favor their position. This does not require the parties to have contemplated every possible legal nuance in advance; it simply supplies a workable answer when the writing's language is otherwise ambiguous.
The parties' actual intent can override the default
This is a default rule, not an absolute one. Section 11 expressly yields where the parties intended otherwise — if the evidence shows the parties meant a term to carry a different legal meaning than the one attached to the place of execution, that intended meaning controls instead. Proving that intended departure typically requires more than a bare assertion — it calls for evidence showing what the parties actually understood the term to mean. A court will not lightly infer such an intended departure from the ordinary reading; the party asserting it carries the burden of showing why the place-of-execution meaning should not control in that particular instance.
Why this matters for cross-border or multi-jurisdiction contracts
This rule becomes especially relevant where a contract is executed in one place but disputed or enforced elsewhere, or where the parties come from different legal backgrounds. Anchoring interpretation to the place of execution gives a predictable starting point, while still allowing proof of a genuinely different shared intent to prevail. In such cases, the place of execution offers a workable default that avoids the deeper complications of determining which of several possible legal systems should otherwise apply. It also gives contracting parties a measure of certainty at the time of signing, since they can generally rely on the legal meanings familiar to them in their own jurisdiction rather than guessing which court might eventually hear a dispute.