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).
subject matternoun [ C ] uk â /ËsÊb.dÊekt ËmÃ¦t.Ér/ us â /ËsÊb.dÊekt ËmÃ¦tÌ¬.É/. âº the things that are being talked or written about, or used as the subject of a piece of art, etc.: