1. half (one of two equal parts of any whole)

a. half (any fraction with a denominator of 2) (mathematics)

b. medio, half-celemin (a traditional unit of dry measure equivalent to about 2.3 L) (historical)

c. medio (the usual container used to measure medios) (historical)

d. medio, half-real (a former coin) (historical, Guatemala, Colombia, Ecuador, Venezuela)

e. medio, half-peso (a former coin) (historical, Dominican Republic)

f. medio, half-sucre (a former coin) (historical, Ecuador)

g. medio, half-balboa (a former coin) (historical, Panama)

h. medio, half-boliviano (a former coin) (historical, Bolivia)

i. medio, half-octavo (a former coin equal to ¹⁄₁₆ real) (historical, Mexico)

j. medio (following decimalization, the notional amount of 6+¹⁄₄ centavos as half of the notional amount of a ¹⁄₈-peseta real and later by extension any 5 centavo coin) (slang, Mexico, Guatemala, El Salvador, Honduras, Costa Rica, Peru)

2. middle (the part of anything located halfway between its ends or extremes in time or along one dimension in space)

a. midfielder, halfback (a person forming part of the middle or central defensive or offensive line, especially in soccer) (sports)

b. synonym of médium (“medium”) (a person claiming to the ability to communicate with the dead)

c. cut (the payment demanded to permit or facilitate some action, especially as a bribe) (politics, business)

d. middle term (the general category that appears in both premises and disappears in the conclusion) (philosophy)

e. mean (the second and third terms of a proportion) (mathematics, usually in the plural)

3. center, heart (the innermost part of anything with regard to all dimensions) (inexact)

4. method, way, means (the actions or things by which some goal is achieved or intended to be achieved, something serving some purpose) (often in the plural)

a. synonym of diligencia (“diligence, hard work”) (as the generally effective means to achieve any goal)

b. medium (a means of communication, especially mass communication) (usually in the plural)

5. medium (the physical space and substance through which some phenomenon occurs) (physics)

a. medium (the physical substances with which art is made) (art)

b. environment (the circumstances that affect a person or animal's development)

c. society (the circumstances in which a person or group of people lives)

d. circle (a particular segment of society) (usually in the plural)

e. habitat (the circumstances in which an animal or group of animals lives)