The Spanish verb 'considerar' (to consider) comes from the Latin verb 'considerare', which meant 'to examine or observe carefully'. The Latin word was formed by combining two elements: the prefix 'con-' meaning 'together' or 'with', and 'sidus' meaning 'star' or 'constellation'. The original sense was likely related to carefully observing the stars together, as ancient astronomers would do when studying constellations. Over time, this meaning broadened from the specific act of studying stars to the more general sense of careful examination and contemplation that we use today.

Some related Spanish words include 'considerado' (considerate), 'consideración' (consideration), and 'desconsidera' (to disregard). These all share the same Latin root and follow similar patterns of meaning around careful thought and attention.

English speakers will recognize the obvious connection to the English word 'consider', which comes from the same Latin root 'considerare'. Other related English words include 'consideration', 'considerable', and 'considerate'. The connection between careful observation (the original meaning) and thoughtful contemplation (the modern meaning) is preserved in both languages.