From Longman Dictionary of Contemporary Englishsecondary stressˌsecondary ˈstress noun [countable, uncountable] technical SLthe second strongest stress that is put on a part of a long word when you speak it. It is shown in this dictionary by the mark (ˌ) → primary stress
Examples from the Corpus
secondary stress• If the stem consists of more than one syllable there will be a secondary stress on one of the syllables of the stem.• If both primary and secondary stress need to be marked it can be done like this: demonstration. 5.2.3.• The stress in these words is called secondary stress.• The last syllable is usually quite prominent so that in some cases it could be said to have secondary stress.• When stress is being discussed, the mark indicates primary stress and indicates secondary stress. 