Sentence:  In looking at meal structures, Douglas (1972) made a clear distinction between the <WSD>afternoon tea</WSD> which is a snack and the high tea which is classified as a light meal. 
Meaning of the word marked with <WSD> tags:  A small meal or snack eaten between lunch and dinner (supper); a period of time set aside for this purpose, taken as a break from work or from a conference.