The Spanish word 'especial' (meaning 'special') traces back to the Latin word 'specere', which meant 'to look' or 'to observe'. From this root, the Latin noun 'species' developed, meaning 'appearance' or 'type'. This then evolved into the Latin adjective 'specialis', meaning 'particular' or 'individual'. The Spanish 'especial' directly inherited this meaning, with the addition of an initial 'e-' (a common feature in Spanish words derived from Latin words beginning with 's' followed by a consonant).

Some related Spanish words include 'especie' (species, kind), 'espectáculo' (show, spectacle), and 'espejo' (mirror) - all of which share the common Latin root 'specere' relating to looking or observing. 'Especie' maintains the connection to types or kinds, while 'espectáculo' relates to something meant to be looked at, and 'espejo' is an object used for looking at oneself.

English speakers can recognize this connection through words like 'special', 'species', 'spectacle', 'specimen', and 'spectator' - all of which derive from the same Latin root 'specere'. The English word 'special' is a particularly close cousin to Spanish 'especial', both in meaning and form. Other related English words maintain connections to the original sense of looking or observing: a 'spectator' is one who looks, a 'spectacle' is something to look at, and 'species' refers to a particular type or appearance of something.