Most definitions are in the Present Simple Tense because a definition is a Fact. We use the Present Simple to talk about Facts and things that are USUALLY true:
The Earth revolves around the sun.
Dogs hate cats.
Generally speaking, Japanese cars are better than American cars.
Practice makes perfect.
We also use it to talk about Routine, Habits about things we USUALLY do:
Most definitions are in the Present Simple Tense because a definition
What do you usually do on weekday mornings?
I usually wake up at 6 am, go jogging, take a shower, have breakfast, and head to work.
Since Routine and Habit is something we do repeatedly, a common question you might ask is HOW OFTEN:
How often do you go jogging?
How often do you go to McDonald’s?
Routine and Habit is what I call the Function of the grammar. Function means Purpose.
In my book English Grammar and Functions, I explain every grammatical structure using Functions and Cues.
The Function of the Present Simple Tense is to talk about Routines, Habits or Facts:
Practice makes Perfect
I usually go jogging in the morning.
She often works on weekends
The main Cue is the word Usually
Dictionary sentences with Usually are usually in the Present Simple tense.
Other cues are Rarely, Sometimes, Often and the question
How often do you shave?
How often do you shave your legs?
Everything you need to know about grammar you can find in my book English Grammar and Functions which is available at Amazon and virtuallynative.com