/ Dictionary / Index S secondment: Meaning and Definition of Find definitions for: se•cond•ment Pronunciation: (si-kond'munt), [key] — n. Brit. the transfer of a military officer or corporate executive to another post for temporary duty. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: secondment (Thesaurus) second mate second messenger Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language