Here are how two different dictionaries define the adjective "contingent":
1. Liable but not certain to occur; possible: "All salaries are reckoned on contingent as well as on actual services" (Ralph Waldo Emerson).
2. Dependent on other conditions or circumstances; conditional: arms sales contingent on the approval of Congress. See Synonyms at dependent.
3. Happening by or subject to chance or accident; unpredictable: contingent developments that jeopardized the negotiations. See Synonyms at accidental.
4. Logic True only under certain conditions; not necessarily or universally true: a contingent proposition.
1. (when: postpositive, often foll by on or upon) dependent on events, conditions, etc, not yet known; conditional
2. (Logic) logic (of a proposition) true under certain conditions, false under others; not necessary
3. (Grammar) (in systemic grammar) denoting contingency (sense 4)
4. (Philosophy) metaphysics (of some being) existing only as a matter of fact; not necessarily existing
5. happening by chance or without known cause; accidental
6. that may or may not happen; uncertain
Thank you to identify the definition that best fits your understanding of the notion of contingent truths.

If need be, thank you to articulate your own definition, with a justification.