Biennial means..
Taking place every other year.
Answer:
Seeing his sister now reminds him both of their time together and of her ability to inspire in him a deeper appreciation of the natural world. As a Romantic poet, Wordsworth revered nature and experiences of the sublime. Hope this helps :D
Explanation:
In "324", the speaker of the poem spends her Sundays at home. She draws a comparison to others, as she states that they mostly spend their Sundays in church. It can also be assumed that the speaker may be outside at her home, as she uses many images of birds, and mentions an orchard.