diff --git a/lib/type/unit/Unit.js b/lib/type/unit/Unit.js
index b3f1c0569..8604f4487 100644
--- a/lib/type/unit/Unit.js
+++ b/lib/type/unit/Unit.js
@@ -1901,7 +1901,23 @@ function factory (type, config, load, typed) {
       value: 6.2831853071795864769252867665793,
       offset: 0
     },
-
+    // arcsec = rad / (3600 * (360 / 2 * pi)) = rad / 0.0000048481368110953599358991410235795
+    arcsec: {
+      name: 'arcsec',
+      base: BASE_UNITS.ANGLE,
+      prefixes: PREFIXES.NONE,
+      value: 0.0000048481368110953599358991410235795,
+      offset: 0
+    },
+    // arcmin = rad / (60 * (360 / 2 * pi)) = rad / 0.00029088820866572159615394846141477
+    arcmin: {
+      name: 'arcmin',
+      base: BASE_UNITS.ANGLE,
+      prefixes: PREFIXES.NONE,
+      value: 0.00029088820866572159615394846141477,
+      offset: 0
+    },
+    
     // Electric current
     A: {
       name: 'A',
@@ -2310,8 +2326,8 @@ function factory (type, config, load, typed) {
     }
   };
 
-  // plurals
-  var PLURALS = {
+  // aliases (formerly plurals)
+  var ALIASES = {
     meters: 'meter',
     inches: 'inch',
     feet: 'foot',
@@ -2353,10 +2369,17 @@ function factory (type, config, load, typed) {
     hours: 'hour',
     days: 'day',
 
+    radian: 'rad',
     radians: 'rad',
+    degree: 'deg',
     degrees: 'deg',
-    gradients: 'grad',
+    gradian: 'grad',
+    gradians: 'grad',
     cycles: 'cycle',
+    arcsecond: 'arcsec',
+    arcseconds: 'arcsec',
+    arcminute: 'arcmin',
+    arcminutes: 'arcmin',
 
     BTUs: 'BTU',
     watts: 'watt',
@@ -2481,23 +2504,23 @@ function factory (type, config, load, typed) {
     unit.dimensions = unit.base.dimensions;
   }    
 
-  for (var name in PLURALS) {
+  for (var name in ALIASES) {
     /* istanbul ignore next (we cannot really test next statement) */
-    if (PLURALS.hasOwnProperty(name)) {
-      var unit = UNITS[PLURALS[name]];
-      var plural = Object.create(unit);
-      plural.name = name;
-      UNITS[name] = plural;
+    if (ALIASES.hasOwnProperty(name)) {
+      var unit = UNITS[ALIASES[name]];
+      var alias = Object.create(unit);
+      alias.name = name;
+      UNITS[name] = alias;
     }
   }
-
+  
   // aliases
   UNITS.lt = UNITS.l;
   UNITS.liter = UNITS.litre;
   UNITS.liters = UNITS.litres;
   UNITS.lb = UNITS.lbm;
   UNITS.lbs = UNITS.lbm;
-
+  
   Unit.PREFIXES = PREFIXES;
   Unit.BASE_UNITS = BASE_UNITS;
   Unit.UNITS = UNITS;