semi-sweet
Word family
Synonym discussion
Sense: adjective/1
All three words describe food or drink that is only mildly sweet, but the balance differs. 'Semi-sweet' sits at the midpoint: there is clear sugar, yet a faint bitterness keeps it from being a dessert-level treat, as with semi-sweet chocolate used in baking. 'Bittersweet' tips further toward the bitter end — you notice the sharp, slightly dark taste first, then the sweetness behind it. 'Lightly sweetened' is the plainest, most everyday choice; it simply means a small amount of sugar was added, with no comment on bitterness at all. A cook reaching for baking chocolate would ask for semi-sweet; a person describing strong dark chocolate might say bittersweet; a label on yogurt or tea would more likely read lightly sweetened.
Common collocations
Etymology
A compound of the prefix 'semi-', meaning 'half' or 'partly', and the adjective 'sweet'. 'Semi-' comes from Latin and is used in English to mark something that is only partway to a full state, so 'semi-sweet' literally describes a taste that is only partly sweet. The term became common in the twentieth century, especially on labels for chocolate and wine.
First known use
1943
1943, in the meaning defined above