Teleport

Teleportation is a form of movement in Dota that instantly moves a target from one point to another. Teleport tends to refer to spells that have a global range and blink refers to spells of limited range; these classifications have a number of distinguishing properties and may be treated differently by different effects.

Teleport
A teleport moves a unit from one point to another instantly and at unlimited range. There is normally a delay associated with a teleport as well as a restriction of where units may teleport to.

Blink
A blink or true blink have very specific parameters that are shared with all other true blinks:
 * They are point-targeted and when cast, moves the casting unit from one point to another at a defined range.
 * The movement is instant, means they do not incorporate any sort of "travel time," although Teleportation has a three-second cast animation.
 * True blinks are disabled while rooted.
 * They disjoint projectiles upon cast.

Pseudo-Blink
Pseudo-blinks is a general term for abilities that instantly change a unit's position. These abilities include those which are very similar to True Blinks, but do not meet the criteria. They are not disabled when rooted and not strictly point-targeted. Some of them always move the hero a fixed distance and some can be interrupted. The moved unit doesn't necessarily has to be the caster. Some pseudo-blinks can disjoint projectiles, but most do not.