Iron-deficiency anemia can cause fatigue (tiredness), shortness of breath, chest pain, and other symptoms. Severe iron-deficiency anemia can lead to heart problems, infections, problems with growth and development in children, and other complications.
Semantics is the study of meaning. It is a wide subject within the general study of language. An understanding of semantics is essential to the study of language acquisition (how language users acquire a sense of meaning, as speakers and writers, listeners and readers) and of language change (how meanings alter over time).
a subject of conversation or discussion: to provide a topic for discussion. 2. the subject or theme of a discourse or of one of its parts. 3. Rhetoric, Logic. a general field of considerations from which arguments can be drawn.