What is meant by mother tongue in the poem to my fellow children?

The poem "To My Fellow Children" by Henry Wadsworth Longfellow uses the term "mother tongue" to refer to the language that a person grows up speaking and learning from their family and community. It is the language that is most familiar and natural to them, often closely associated with their cultural and personal identity.

In the context of the poem, the phrase "mother tongue" appears as part of the line:

"With one language and with one mother-tongue..."

This line emphasizes the unity and commonality among children from different backgrounds and nations. It suggests that despite the diversity of languages spoken around the world, all children share a universal bond through the experience of learning and speaking their own native language.

The use of the term "mother tongue" in the poem carries a sense of affection, familiarity, and belonging, as it evokes the nurturing and supportive environment provided by a mother. By referencing the "mother tongue," the poet highlights the importance of language as a fundamental aspect of human connection, identity, and community.