Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Well grounded; just.
  • adjective Producing the desired results; efficacious.
  • adjective Having legal force; effective or binding.
  • adjective Containing premises from which the conclusion may logically be derived.
  • adjective Correctly inferred or deduced from a premise.
  • adjective Archaic Of sound health; robust.

from The Century Dictionary.

  • Strong: powerful; efficient.
  • Sufficiently supported by fact; well-grounded; sound; just; good: capable of being justified or defended; not weak or defective: as, a valid reason; a valid objection.
  • Good or sufficient in point of law; efficacious; executed with the proper formalities; incapable of being rightfully overthrown or set aside; sustainable and effective in law, as distinguished from that which exists or took place in fact or appearance, but has not the requisites to entitle it to be. recognized and enforced by law: as, a, valid deed; a valid covenant; a valid instrument of any kind; a valid claim or title; a valid marriage; a valid ordination.—4. In zoology and hot., having sufficient classificatory strength or force; scientifically founded or well-grounded; securely established: as, a valid family, genus, or species; & valid classification.
  • In logic, having, as an argument, that degree of formal strength and truth that it professes to have.
  • In chem., having valence: chiefly used in composition, as in univalid for univalent, etc.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective obsolete Strong; powerful; efficient.
  • adjective Having sufficient strength or force; founded in truth; capable of being justified, defended, or supported; not weak or defective; sound; good; efficacious.
  • adjective (Law) Having legal strength or force; executed with the proper formalities; incapable of being rightfully overthrown or set aside.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Well grounded or justifiable, pertinent.
  • adjective Acceptable, proper or correct.
  • adjective Related to the current topic, or presented within context, relevant.
  • adjective logic A formula or system that evaluates to true regardless of the input values.
  • adjective logic An argument whose conclusion is always true whenever its premises are true.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective still legally acceptable
  • adjective well grounded in logic or truth or having legal force

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French valide, from Old French, from Latin validus, strong, from valēre, to be strong; see wal- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle French valide

Examples

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