During the conference, there were light refreshments and tea available.

refreshments 是名词 refreshment 的复数形式。refreshment 由动词 refresh（使恢复精力）加名词后缀 -ment 构成，原意是"恢复精力"，引申为"提神的食物或饮料"，在这里特指"会议或活动中提供的简单点心和小吃"。